Fix IllegalStateException

✅ Solution

The "IllegalStateException" in Elasticsearch typically arises from attempting to modify an object or resource when it's in an inappropriate state, like closing a closed index or accessing a resource before it's initialized. Fix this by carefully reviewing the code sections triggering the exception to ensure objects are accessed and modified only within their valid lifecycle states, and that resources are fully initialized before use; proper synchronization mechanisms may be needed for multi-threaded access.