feat: Support Password Access for ElasticSearch (#1072)

### What problem does this PR solve?

Using password authentication to access ElasticSearch is essential,
especially in a production environment.

This PR will enable password access support.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

docker/.env

@@ -1,12 +1,13 @@
 # Version of Elastic products
 STACK_VERSION=8.11.3
 
-# Set the cluster name
-CLUSTER_NAME=rag_flow
 
 # Port to expose Elasticsearch HTTP API to the host
 ES_PORT=1200
 
+# Set the Elasticsearch password
+ELASTIC_PASSWORD=infini_rag_flow
+
 # Port to expose Kibana to the host
 KIBANA_PORT=6601