Support serverless (elastic#36649)

* make serverless integration tests run

* update deps

* linter, error handling

* still fixing error handling

* fixing old formatting verbs

* still finding format verbs

* add docs, fix typos

* initial functional pass

* fix setup, config

* fix naming of config section

* add headers

* make linter happy

* still making linter happy

* tinkering with tests

* still fixing tests

* revert file

* tinker with export

* fix logging in tests

* fix load checking in setup

* fix url in integration test

* fix commented out test line

* stil tinkering with integraton test

* fix bad init in tests, add more check to ES handler

* add init checks for client handler, add more unit tests

* make template loader serverless aware

* change naming, error handling, rework config system

* fix up integration tests

* clean up load tests

* stil making linter happy

* simplify manager init, fix tests, update docs

* minor test fixes

* clean up tests

* clean up typos, remove legacy error handling

* expand logging

* logging, error handling changes

* change error messages

* update lifetimes for serverless elasticsearch

* fix integration tests

* change error handling, clean up log messages

* tinker with DSL config name

* update docs

* fix name example

auditbeat/auditbeat.reference.yml

@@ -1338,6 +1338,30 @@ setup.template.settings:
 # Overwrite the lifecycle policy at startup. The default is false.
 #setup.ilm.overwrite: false
 
+# ======================== Data Stream Lifecycle (DSL) =========================
+
+# Configure Data Stream Lifecycle to manage data streams while connected to Serverless elasticsearch. 
+# These settings are mutually exclusive with ILM settings which are not supported in Serverless projects.
+
+# Enable DSL support. Valid values are true, or false.
+#setup.dsl.enabled: true
+
+# Set the lifecycle policy name or pattern. For DSL, this name must match the data stream that the lifecycle is for.
+# The default data stream pattern is auditbeat-%{[agent.version]}"
+#setup.dsl.data_stream_pattern: "auditbeat-%{[agent.version]}"
+
+# The path to a JSON file that contains a lifecycle policy configuration. Used
+# to load your own lifecycle policy.
+# If no custom policy is specified, a default policy with a lifetime of 7 days will be created.
+#setup.dsl.policy_file:
+
+# Disable the check for an existing lifecycle policy. The default is true. If
+# you disable this check, set setup.dsl.overwrite: true so the lifecycle policy
+# can be installed.
+#setup.dsl.check_exists: true
+
+# Overwrite the lifecycle policy at startup. The default is false.
+#setup.dsl.overwrite: false
 # =================================== Kibana ===================================
 
 # Starting with Beats version 6.0.0, the dashboards are loaded via the Kibana API.

filebeat/filebeat.reference.yml

@@ -2434,6 +2434,30 @@ setup.template.settings:
 # Overwrite the lifecycle policy at startup. The default is false.
 #setup.ilm.overwrite: false
 
+# ======================== Data Stream Lifecycle (DSL) =========================
+
+# Configure Data Stream Lifecycle to manage data streams while connected to Serverless elasticsearch. 
+# These settings are mutually exclusive with ILM settings which are not supported in Serverless projects.
+
+# Enable DSL support. Valid values are true, or false.
+#setup.dsl.enabled: true
+
+# Set the lifecycle policy name or pattern. For DSL, this name must match the data stream that the lifecycle is for.
+# The default data stream pattern is filebeat-%{[agent.version]}"
+#setup.dsl.data_stream_pattern: "filebeat-%{[agent.version]}"
+
+# The path to a JSON file that contains a lifecycle policy configuration. Used
+# to load your own lifecycle policy.
+# If no custom policy is specified, a default policy with a lifetime of 7 days will be created.
+#setup.dsl.policy_file:
+
+# Disable the check for an existing lifecycle policy. The default is true. If
+# you disable this check, set setup.dsl.overwrite: true so the lifecycle policy
+# can be installed.
+#setup.dsl.check_exists: true
+
+# Overwrite the lifecycle policy at startup. The default is false.
+#setup.dsl.overwrite: false
 # =================================== Kibana ===================================
 
 # Starting with Beats version 6.0.0, the dashboards are loaded via the Kibana API.

heartbeat/heartbeat.reference.yml

@@ -1430,6 +1430,30 @@ setup.template.settings:
 # Overwrite the lifecycle policy at startup. The default is false.
 #setup.ilm.overwrite: false
 
+# ======================== Data Stream Lifecycle (DSL) =========================
+
+# Configure Data Stream Lifecycle to manage data streams while connected to Serverless elasticsearch. 
+# These settings are mutually exclusive with ILM settings which are not supported in Serverless projects.
+
+# Enable DSL support. Valid values are true, or false.
+#setup.dsl.enabled: true
+
+# Set the lifecycle policy name or pattern. For DSL, this name must match the data stream that the lifecycle is for.
+# The default data stream pattern is heartbeat-%{[agent.version]}"
+#setup.dsl.data_stream_pattern: "heartbeat-%{[agent.version]}"
+
+# The path to a JSON file that contains a lifecycle policy configuration. Used
+# to load your own lifecycle policy.
+# If no custom policy is specified, a default policy with a lifetime of 7 days will be created.
+#setup.dsl.policy_file:
+
+# Disable the check for an existing lifecycle policy. The default is true. If
+# you disable this check, set setup.dsl.overwrite: true so the lifecycle policy
+# can be installed.
+#setup.dsl.check_exists: true
+
+# Overwrite the lifecycle policy at startup. The default is false.
+#setup.dsl.overwrite: false
 # =================================== Kibana ===================================
 
 # Starting with Beats version 6.0.0, the dashboards are loaded via the Kibana API.

libbeat/_meta/config/default.reference.yml.tmpl

@@ -14,6 +14,7 @@
 {{template "setup.dashboards.reference.yml.tmpl" .}}
 {{template "setup.template.reference.yml.tmpl" .}}
 {{template "setup.ilm.reference.yml.tmpl" .}}
+{{template "setup.dsl.reference.yml.tmpl" .}}
 {{template "setup.kibana.reference.yml.tmpl" .}}
 {{template "logging.reference.yml.tmpl" .}}
 {{template "monitoring.reference.yml.tmpl" .}}

libbeat/_meta/config/setup.dsl.reference.yml.tmpl

@@ -0,0 +1,24 @@
+{{header "Data Stream Lifecycle (DSL)"}}
+
+# Configure Data Stream Lifecycle to manage data streams while connected to Serverless elasticsearch. 
+# These settings are mutually exclusive with ILM settings which are not supported in Serverless projects.
+
+# Enable DSL support. Valid values are true, or false.
+#setup.dsl.enabled: true
+
+# Set the lifecycle policy name or pattern. For DSL, this name must match the data stream that the lifecycle is for.
+# The default data stream pattern is {{.BeatName}}-%{[agent.version]}"
+#setup.dsl.data_stream_pattern: "{{.BeatName}}-%{[agent.version]}"
+
+# The path to a JSON file that contains a lifecycle policy configuration. Used
+# to load your own lifecycle policy.
+# If no custom policy is specified, a default policy with a lifetime of 7 days will be created.
+#setup.dsl.policy_file:
+
+# Disable the check for an existing lifecycle policy. The default is true. If
+# you disable this check, set setup.dsl.overwrite: true so the lifecycle policy
+# can be installed.
+#setup.dsl.check_exists: true
+
+# Overwrite the lifecycle policy at startup. The default is false.
+#setup.dsl.overwrite: false

libbeat/cmd/export/ilm_policy.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/elastic/beats/v7/libbeat/cmd/instance"
 	"github.com/elastic/beats/v7/libbeat/idxmgmt"
-	"github.com/elastic/beats/v7/libbeat/idxmgmt/ilm"
+	"github.com/elastic/beats/v7/libbeat/idxmgmt/lifecycle"
 )
 
 // GenGetILMPolicyCmd is the command used to export the ilm policy.
@@ -35,14 +35,20 @@ func GenGetILMPolicyCmd(settings instance.Settings) *cobra.Command {
 			dir, _ := cmd.Flags().GetString("dir")
 
 			if settings.ILM == nil {
-				settings.ILM = ilm.StdSupport
+				settings.ILM = lifecycle.StdSupport
 			}
 			b, err := instance.NewInitializedBeat(settings)
 			if err != nil {
 				fatalfInitCmd(err)
 			}
 
-			clientHandler := idxmgmt.NewFileClientHandler(newIdxmgmtClient(dir, version))
+			// the way this works, we decide to export ILM or DSL based on the user's config.
+			// This means that if a user has no index management config, we'll default to ILM, regardless of what the user
+			// is connected to. Might not be a problem since a user who doesn't have any custom lifecycle config has nothing to export?
+			clientHandler, err := idxmgmt.NewFileClientHandler(newIdxmgmtClient(dir, version), b.Info, b.Config.LifecycleConfig)
+			if err != nil {
+				fatalf("error creating file handler: %s", err)
+			}
 			idxManager := b.IdxSupporter.Manager(clientHandler, idxmgmt.BeatsAssets(b.Fields))
 			if err := idxManager.Setup(idxmgmt.LoadModeDisabled, idxmgmt.LoadModeForce); err != nil {
 				fatalf("Error exporting ilm-policy: %+v.", err)

libbeat/cmd/export/template.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/elastic/beats/v7/libbeat/cmd/instance"
 	"github.com/elastic/beats/v7/libbeat/idxmgmt"
-	"github.com/elastic/beats/v7/libbeat/idxmgmt/ilm"
+	"github.com/elastic/beats/v7/libbeat/idxmgmt/lifecycle"
 )
 
 // GenTemplateConfigCmd is the command used to export the elasticsearch template.
@@ -36,18 +36,21 @@ func GenTemplateConfigCmd(settings instance.Settings) *cobra.Command {
 			noILM, _ := cmd.Flags().GetBool("noilm")
 
 			if noILM {
-				settings.ILM = ilm.NoopSupport
+				settings.ILM = lifecycle.NoopSupport
 			}
 			if settings.ILM == nil {
-				settings.ILM = ilm.StdSupport
+				settings.ILM = lifecycle.StdSupport
 			}
 
 			b, err := instance.NewInitializedBeat(settings)
 			if err != nil {
 				fatalfInitCmd(err)
 			}
 
-			clientHandler := idxmgmt.NewFileClientHandler(newIdxmgmtClient(dir, version))
+			clientHandler, err := idxmgmt.NewFileClientHandler(newIdxmgmtClient(dir, version), b.Info, b.Config.LifecycleConfig)
+			if err != nil {
+				fatalf("error creating file handler: %s", err)
+			}
 			idxManager := b.IdxSupporter.Manager(clientHandler, idxmgmt.BeatsAssets(b.Fields))
 			if err := idxManager.Setup(idxmgmt.LoadModeForce, idxmgmt.LoadModeDisabled); err != nil {
 				fatalf("Error exporting template: %+v.", err)

libbeat/cmd/instance/beat.go

@@ -54,6 +54,7 @@ import (
 	"github.com/elastic/beats/v7/libbeat/esleg/eslegclient"
 	"github.com/elastic/beats/v7/libbeat/features"
 	"github.com/elastic/beats/v7/libbeat/idxmgmt"
+	"github.com/elastic/beats/v7/libbeat/idxmgmt/lifecycle"
 	"github.com/elastic/beats/v7/libbeat/instrumentation"
 	"github.com/elastic/beats/v7/libbeat/kibana"
 	"github.com/elastic/beats/v7/libbeat/management"
@@ -133,6 +134,9 @@ type beatConfig struct {
 	// monitoring settings
 	MonitoringBeatConfig monitoring.BeatConfig `config:",inline"`
 
+	// ILM settings
+	LifecycleConfig lifecycle.RawConfig `config:",inline"`
+
 	// central management settings
 	Management *config.C `config:"management"`
 
@@ -671,7 +675,13 @@ func (b *Beat) Setup(settings Settings, bt beat.Creator, setup SetupSettings) er
 			if setup.IndexManagement || setup.ILMPolicy {
 				loadILM = idxmgmt.LoadModeEnabled
 			}
-			m := b.IdxSupporter.Manager(idxmgmt.NewESClientHandler(esClient), idxmgmt.BeatsAssets(b.Fields))
+
+			mgmtHandler, err := idxmgmt.NewESClientHandler(esClient, b.Info, b.Config.LifecycleConfig)
+			if err != nil {
+				return fmt.Errorf("error creating index management handler: %w", err)
+			}
+
+			m := b.IdxSupporter.Manager(mgmtHandler, idxmgmt.BeatsAssets(b.Fields))
 			if ok, warn := m.VerifySetup(loadTemplate, loadILM); !ok {
 				fmt.Println(warn)
 			}
@@ -1065,7 +1075,11 @@ func (b *Beat) registerESIndexManagement() error {
 
 func (b *Beat) indexSetupCallback() elasticsearch.ConnectCallback {
 	return func(esClient *eslegclient.Connection) error {
-		m := b.IdxSupporter.Manager(idxmgmt.NewESClientHandler(esClient), idxmgmt.BeatsAssets(b.Fields))
+		mgmtHandler, err := idxmgmt.NewESClientHandler(esClient, b.Info, b.Config.LifecycleConfig)
+		if err != nil {
+			return fmt.Errorf("error creating index management handler: %w", err)
+		}
+		m := b.IdxSupporter.Manager(mgmtHandler, idxmgmt.BeatsAssets(b.Fields))
 		return m.Setup(idxmgmt.LoadModeEnabled, idxmgmt.LoadModeEnabled)
 	}
 }

libbeat/cmd/instance/settings.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/elastic/beats/v7/libbeat/cfgfile"
 	"github.com/elastic/beats/v7/libbeat/idxmgmt"
-	"github.com/elastic/beats/v7/libbeat/idxmgmt/ilm"
+	"github.com/elastic/beats/v7/libbeat/idxmgmt/lifecycle"
 	"github.com/elastic/beats/v7/libbeat/monitoring/report"
 	"github.com/elastic/beats/v7/libbeat/publisher/processing"
 )
@@ -42,7 +42,7 @@ type Settings struct {
 
 	// load custom index manager. The config object will be the Beats root configuration.
 	IndexManagement idxmgmt.SupportFactory
-	ILM             ilm.SupportFactory
+	ILM             lifecycle.SupportFactory
 
 	Processing processing.SupportFactory
 

libbeat/common/fmtstr/formatevents.go

@@ -84,7 +84,6 @@ type eventEvalContext struct {
 }
 
 var (
-	errMissingKeys   = errors.New("missing keys")
 	errConvertString = errors.New("can not convert to string")
 )
 
@@ -157,19 +156,24 @@ func CompileEvent(in string) (*EventFormatString, error) {
 func (fs *EventFormatString) Unpack(v interface{}) error {
 	s, err := tryConvString(v)
 	if err != nil {
-		return err
+		return fmt.Errorf("error converting type %T to event formatter: %w", v, err)
 	}
 
 	tmp, err := CompileEvent(s)
 	if err != nil {
-		return err
+		return fmt.Errorf("error compiling event formatter: %w", err)
 	}
 
 	// init fs from tmp
 	*fs = *tmp
 	return nil
 }
 
+// IsInitialized returns true if the underlying event formatter is prepared to format an event
+func (fs *EventFormatString) IsInitialized() bool {
+	return fs.formatter != nil
+}
+
 // NumFields returns number of unique event fields used by the format string.
 func (fs *EventFormatString) NumFields() int {
 	return len(fs.fields)
@@ -190,6 +194,9 @@ func (fs *EventFormatString) Fields() []string {
 // Run executes the format string returning a new expanded string or an error
 // if execution or event field expansion fails.
 func (fs *EventFormatString) Run(event *beat.Event) (string, error) {
+	if !fs.IsInitialized() {
+		return "", fmt.Errorf("event formatter is nil")
+	}
 	ctx := newEventCtx(len(fs.fields))
 	defer releaseCtx(ctx)
 
@@ -296,7 +303,7 @@ func (e *eventFieldCompiler) compileEventField(
 	ops []VariableOp,
 ) (FormatEvaler, error) {
 	if len(ops) > 1 {
-		return nil, errors.New("Too many format modifiers given")
+		return nil, errors.New("too many format modifiers given")
 	}
 
 	defaultValue := ""
@@ -340,34 +347,26 @@ func (e *eventFieldCompiler) compileTimestamp(
 	ops []VariableOp,
 ) (FormatEvaler, error) {
 	if expression[0] != '+' {
-		return nil, errors.New("No timestamp expression")
+		return nil, errors.New("no timestamp expression")
 	}
 
 	formatter, err := dtfmt.NewFormatter(expression[1:])
 	if err != nil {
-		return nil, fmt.Errorf("%v in timestamp expression", err)
+		return nil, fmt.Errorf("%w in timestamp expression", err)
 	}
 
 	e.timestamp = true
 	return &eventTimestampEvaler{formatter}, nil
 }
 
 func (e *eventFieldEvaler) Eval(c interface{}, out *bytes.Buffer) error {
-	type stringer interface {
-		String() string
-	}
-
 	ctx := c.(*eventEvalContext)
 	s := ctx.keys[e.index]
 	_, err := out.WriteString(s)
 	return err
 }
 
 func (e *defaultEventFieldEvaler) Eval(c interface{}, out *bytes.Buffer) error {
-	type stringer interface {
-		String() string
-	}
-
 	ctx := c.(*eventEvalContext)
 	s := ctx.keys[e.index]
 	if s == "" {
@@ -385,7 +384,7 @@ func (e *eventTimestampEvaler) Eval(c interface{}, out *bytes.Buffer) error {
 
 func parseEventPath(field string) (string, error) {
 	field = strings.Trim(field, " \n\r\t")
-	var fields []string
+	fields := []string{}
 
 	for len(field) > 0 {
 		if field[0] != '[' {

libbeat/dashboards/kibana_loader.go

@@ -61,7 +61,7 @@ type KibanaLoader struct {
 // NewKibanaLoader creates a new loader to load Kibana files
 func NewKibanaLoader(ctx context.Context, cfg *config.C, dashboardsConfig *Config, hostname string, msgOutputter MessageOutputter, beatname string) (*KibanaLoader, error) {
 	if cfg == nil || !cfg.Enabled() {
-		return nil, fmt.Errorf("Kibana is not configured or enabled")
+		return nil, fmt.Errorf("kibana is not configured or enabled")
 	}
 
 	client, err := getKibanaClient(ctx, cfg, dashboardsConfig.Retry, 0, beatname)
@@ -127,7 +127,7 @@ func (loader KibanaLoader) ImportIndexFile(file string) error {
 // ImportIndex imports the passed index pattern to Kibana
 func (loader KibanaLoader) ImportIndex(pattern mapstr.M) error {
 	if loader.version.LessThan(minimumRequiredVersionSavedObjects) {
-		return fmt.Errorf("Kibana version must be at least " + minimumRequiredVersionSavedObjects.String())
+		return fmt.Errorf("kibana version must be at least " + minimumRequiredVersionSavedObjects.String())
 	}
 
 	var errs multierror.Errors

libbeat/esleg/eslegclient/connection.go

@@ -423,6 +423,7 @@ func (conn *Connection) getVersion() error {
 	}
 
 	if versionData.Version.BuildFlavor == "serverless" {
+		conn.log.Info("build flavor of es is severless, marking connection as serverless")
 		conn.isServerless = true
 	} else if versionData.Version.BuildFlavor == "default" {
 		conn.isServerless = false