[bug] Fix elasticsearch library to <7.14
After the latest changes in Elasticsearch, python library detects if the server is a real ElasticSearch or is an OpenDistro server.
Related issue: cauldron#723 (closed)
After the latest changes in Elasticsearch, python library detects if the server is a real ElasticSearch or is an OpenDistro server.
Related issue: cauldron#723 (closed)