Hi @Mert_Mahanoglu,
All the available plugins are listed in the docs you’ve linked to there, we dont have anything specifically for setting ES credentials, just the one to set custom headers for ES requests.
Other than setting your credentials in the config file you can also opt to use the environment variables CAMUNDA_OPTIMIZE_ELASTICSEARCH_SECURITY_USERNAME and CAMUNDA_OPTIMIZE_ELASTICSEARCH_SECURITY_PASSWORD to set credentials for basic auth.