[API] Adds active_only flag to security.get_api_key

Co-authored-by: Fernando Briano <[email protected]>

elasticsearch-api/lib/elasticsearch/api/actions/security/get_api_key.rb

@@ -30,6 +30,7 @@ module Actions
         # @option arguments [String] :realm_name realm name of the user who created this API key to be retrieved
         # @option arguments [Boolean] :owner flag to query API keys owned by the currently authenticated user
         # @option arguments [Boolean] :with_limited_by flag to show the limited-by role descriptors of API Keys
+        # @option arguments [Boolean] :active_only flag to limit response to only active (not invalidated or expired) API keys
         # @option arguments [Hash] :headers Custom HTTP headers
         #
         # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-api-key.html