Update admin default password in CI

.ci/opensearch/action.yml

@@ -17,10 +17,10 @@ inputs:
     description: 'Port where you want to run OpenSearch'
     required: false
     default: 9200
-  opensearch_password:
+  opensearch-initial-admin-password:
     description: 'The password for the user admin in your cluster'
     required: false
-    default: 'admin'
+    default: 'myStrongPassword123!'
 
 runs:
   using: 'docker'
@@ -30,3 +30,4 @@ runs:
     NODES: ${{ inputs.nodes }}
     PORT: ${{ inputs.port }}
     SECURITY_ENABLED: ${{ inputs.security-enabled }}
+    OPENSEARCH_INITIAL_ADMIN_PASSWORD: ${{ inputs.opensearch-initial-admin-password }}

.ci/opensearch/run-opensearch.sh

@@ -12,7 +12,7 @@ do
   port=$((PORT + $node - 1))
 
   if [[ "$SECURITY_ENABLED" == "true" ]]; then
-    healthcmd="curl -vvv -s --insecure -u admin:admin --fail https://localhost:$port/_cluster/health || exit 1"
+    healthcmd="curl -vvv -s --insecure -u admin:$OPENSEARCH_INITIAL_ADMIN_PASSWORD --fail https://localhost:$port/_cluster/health || exit 1"
     security=($(cat <<-END
 
 END
@@ -34,6 +34,7 @@ END
     --env discovery.type=single-node \
     --env bootstrap.memory_lock=true \
     --env "OPENSEARCH_JAVA_OPTS=-Xms4g -Xmx4g" \
+    --env OPENSEARCH_INITIAL_ADMIN_PASSWORD=$OPENSEARCH_INITIAL_ADMIN_PASSWORD \
     "${security[@]}" \
     --publish "${port}:${port}" \
     --ulimit nofile=65536:65536 \