[API] Removes unsupported API esql.query

Author: picandocodigo

lib/elasticsearch-serverless/api.rb

@@ -62,7 +62,6 @@ def perform_request(method, path, params = {}, body = nil, headers = nil, reques
       :connector,
       :enrich,
       :eql,
-      :esql,
       :graph,
       :indices,
       :inference,