Encountered exception while instantiating the plugin OpenSearchSink

[xsevy]

For some reason I'm unable to create the metrics pipeline.
Here's my config

otel-trace-pipeline:
  # workers is the number of threads processing data in each pipeline. 
  # We recommend same value for all pipelines.
  # default value is 1, set a value based on the machine you are running Data Prepper
  workers: 1
  # delay in milliseconds is how often the worker threads should process data.
  # Recommend not to change this config as we want the otel-trace-pipeline to process as quick as possible
  # default value is 3_000 ms
  delay: "100" 
  source:
    otel_trace_source:
      #record_type: event  # Add this when using Data Prepper 1.x. This option is removed in 2.0
      ssl: false # Change this to enable encryption in transit
      authentication:
        unauthenticated:
      health_check_service: true
      proto_reflection_service: true
      port: ${otel_trace_source_port}

  buffer:
    bounded_blocking:
       # buffer_size is the number of ExportTraceRequest from otel-collector the data prepper should hold in memeory. 
       # We recommend to keep the same buffer_size for all pipelines. 
       # Make sure you configure sufficient heap
       # default value is 12800
       buffer_size: 25600
       # This is the maximum number of request each worker thread will process within the delay.
       # Default is 200.
       # Make sure buffer_size >= workers * batch_size
       batch_size: 400
  sink:
    - pipeline:
        name: "raw-pipeline"
    - pipeline:
        name: "service-map-pipeline"
raw-pipeline:
  # Configure same as the otel-trace-pipeline
  workers: 8 
  # We recommend using the default value for the raw-pipeline.
  delay: "3000" 
  source:
    pipeline:
      name: "otel-trace-pipeline"
  buffer:
      bounded_blocking:
         # Configure the same value as in otel-trace-pipeline
         # Make sure you configure sufficient heap
         # default value is 12800
         buffer_size: 25600
         # This is the maximum number of request each worker thread will process within the delay.
         # Default is 200.
         # Make sure buffer_size >= workers * batch_size
         # The raw processor does bulk request to your OpenSearch sink, so configure the batch_size higher.
         batch_size: 3200
  processor:
    - otel_trace_raw:
    - otel_trace_group:
        hosts:
          - ${opensearch_endpoint}
        # Change to your credentials
        # username: "admin"
        # password: "admin"
        # Add a certificate file if you are accessing an OpenSearch cluster with a self-signed certificate  
        #cert: /path/to/cert
        # If you are connecting to an Amazon OpenSearch Service domain without
        # Fine-Grained Access Control, enable these settings. Comment out the
        # username and password above.
        #aws_sigv4: true
        #aws_region: us-east-1
  sink:
    - opensearch:
        hosts:
          - ${opensearch_endpoint}
        index_type: trace-analytics-raw
        # Change to your credentials
        # username: "admin"
        # password: "admin"
        # Add a certificate file if you are accessing an OpenSearch cluster with a self-signed certificate  
        #cert: /path/to/cert
        # If you are connecting to an Amazon OpenSearch Service domain without
        # Fine-Grained Access Control, enable these settings. Comment out the
        # username and password above.
        #aws_sigv4: true
        #aws_region: us-east-1
service-map-pipeline:
  workers: 8
  delay: "100"
  source:
    pipeline:
      name: "otel-trace-pipeline"
  processor:
    - service_map_stateful:
        # The window duration is the maximum length of time the data prepper stores the most recent trace data to evaluvate service-map relationships. 
        # The default is 3 minutes, this means we can detect relationships between services from spans reported in last 3 minutes.
        # Set higher value if your applications have higher latency. 
        window_duration: 180 
  buffer:
      bounded_blocking:
         # buffer_size is the number of ExportTraceRequest from otel-collector the data prepper should hold in memeory. 
         # We recommend to keep the same buffer_size for all pipelines. 
         # Make sure you configure sufficient heap
         # default value is 12800
         buffer_size: 25600
         # This is the maximum number of request each worker thread will process within the delay.
         # Default is 200.
         # Make sure buffer_size >= workers * batch_size
         batch_size: 400
  sink:
    - opensearch:
        hosts:
          - ${opensearch_endpoint}
        index_type: trace-analytics-service-map
        # Change to your credentials
        # username: "admin"
        # password: "admin"
        # Add a certificate file if you are accessing an OpenSearch cluster with a self-signed certificate  
        #cert: /path/to/cert
        # If you are connecting to an Amazon OpenSearch Service domain without
        # Fine-Grained Access Control, enable these settings. Comment out the
        # username and password above.
        #aws_sigv4: true
        #aws_region: us-east-1


metrics-pipeline:
  source:
    otel_metrics_source:
      ssl: false
      authentication:
        unauthenticated:
  processor:
    - otel_metrics_raw_processor:
  sink:
    # - stdout:
    - opensearch:
      hosts: 
        - ${opensearch_endpoint}
    #   # username: username
    #   # password: password
    #   index: metrics-otel-v1

the error I'm getting

2023-08-15T07:24:10,205 [main] ERROR org.opensearch.dataprepper.plugin.PluginCreator - Encountered exception while instantiating the plugin OpenSearchSink
java.lang.reflect.InvocationTargetException: null
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
	at org.opensearch.dataprepper.plugin.PluginCreator.newPluginInstance(PluginCreator.java:40) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugin.DefaultPluginFactory.loadPlugin(DefaultPluginFactory.java:75) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildSinkOrConnector(PipelineParser.java:310) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildRoutedSinkOrConnector(PipelineParser.java:296) ~[data-prepper-core-2.3.0.jar:?]
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildPipelineFromConfiguration(PipelineParser.java:216) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.parseConfiguration(PipelineParser.java:122) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.DataPrepper.<init>(DataPrepper.java:67) ~[data-prepper-core-2.3.0.jar:2.3.0]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:296) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:920) [spring-context-5.3.27.jar:5.3.27]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) [spring-context-5.3.27.jar:5.3.27]
	at org.opensearch.dataprepper.AbstractContextManager.start(AbstractContextManager.java:59) [data-prepper-core-2.3.0.jar:2.3.0]
	at org.opensearch.dataprepper.AbstractContextManager.getDataPrepperBean(AbstractContextManager.java:45) [data-prepper-core-2.3.0.jar:2.3.0]
	at org.opensearch.dataprepper.DataPrepperExecute.main(DataPrepperExecute.java:39) [data-prepper-main-2.3.0.jar:2.3.0]
Caused by: java.lang.IllegalArgumentException: hosts cannot be null
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145) ~[guava-31.1-jre.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration$Builder.<init>(ConnectionConfiguration.java:467) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration.readConnectionConfiguration(ConnectionConfiguration.java:170) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSinkConfiguration.readESConfig(OpenSearchSinkConfiguration.java:44) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSink.<init>(OpenSearchSink.java:119) ~[opensearch-2.3.0.jar:?]
	... 70 more
2023-08-15T07:24:10,267 [main] ERROR org.opensearch.dataprepper.parser.PipelineParser - Construction of pipeline components failed, skipping building of pipeline [metrics-pipeline] and its connected pipelines
org.opensearch.dataprepper.model.plugin.PluginInvocationException: Exception throw from the plugin'OpenSearchSink'.
	at org.opensearch.dataprepper.plugin.PluginCreator.newPluginInstance(PluginCreator.java:47) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugin.DefaultPluginFactory.loadPlugin(DefaultPluginFactory.java:75) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildSinkOrConnector(PipelineParser.java:310) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildRoutedSinkOrConnector(PipelineParser.java:296) ~[data-prepper-core-2.3.0.jar:?]
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?]
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
	at org.opensearch.dataprepper.parser.PipelineParser.buildPipelineFromConfiguration(PipelineParser.java:216) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.parser.PipelineParser.parseConfiguration(PipelineParser.java:122) ~[data-prepper-core-2.3.0.jar:?]
	at org.opensearch.dataprepper.DataPrepper.<init>(DataPrepper.java:67) ~[data-prepper-core-2.3.0.jar:2.3.0]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:296) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) [spring-beans-5.3.27.jar:5.3.27]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:920) [spring-context-5.3.27.jar:5.3.27]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) [spring-context-5.3.27.jar:5.3.27]
	at org.opensearch.dataprepper.AbstractContextManager.start(AbstractContextManager.java:59) [data-prepper-core-2.3.0.jar:2.3.0]
	at org.opensearch.dataprepper.AbstractContextManager.getDataPrepperBean(AbstractContextManager.java:45) [data-prepper-core-2.3.0.jar:2.3.0]
	at org.opensearch.dataprepper.DataPrepperExecute.main(DataPrepperExecute.java:39) [data-prepper-main-2.3.0.jar:2.3.0]
Caused by: java.lang.reflect.InvocationTargetException
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
	at org.opensearch.dataprepper.plugin.PluginCreator.newPluginInstance(PluginCreator.java:40) ~[data-prepper-core-2.3.0.jar:?]
	... 64 more
Caused by: java.lang.IllegalArgumentException: hosts cannot be null
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145) ~[guava-31.1-jre.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration$Builder.<init>(ConnectionConfiguration.java:467) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration.readConnectionConfiguration(ConnectionConfiguration.java:170) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSinkConfiguration.readESConfig(OpenSearchSinkConfiguration.java:44) ~[opensearch-2.3.0.jar:?]
	at org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSink.<init>(OpenSearchSink.java:119) ~[opensearch-2.3.0.jar:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?]
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?]
	at org.opensearch.dataprepper.plugin.PluginCreator.newPluginInstance(PluginCreator.java:40) ~[data-prepper-core-2.3.0.jar:?]
	... 64 more

the traces are working fine.

[dlvenable]

Hello @xsevy , I see you have your hosts listed as ${opensearch_endpoint}. Currently Data Prepper does not support any variable substitution for this property. Can you be sure to se the endpoint to the actual value?

e.g.

sink:
    - opensearch:
      hosts: 
        - http://myopensearch:9090

[arichtman-srt]

FWIW I worked around this by using envsubst in a wrapper/init process to do the substitution