code: def reindex(self, body, params=None):
          
          if body in SKIP_IN_PATH:
              raise ValueError("Empty value passed for a required argument 'body'.")
          return self.transport.perform_request(
              "POST", "/_reindex", params=params, body=body
          )
docs: Reindex all documents from one index to another.
          `<https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html>`_
  
          :arg body: The search definition using the Query DSL and the prototype
              for the index request.
          :arg refresh: Should the effected indexes be refreshed?
          :arg requests_per_second: The throttle to set on this request in sub-
              requests per second. -1 means no throttle., default 0
          :arg slices: The number of slices this task should be divided into.
              Defaults to 1 meaning the task isn't sliced into subtasks., default
              1
          :arg timeout: Time each individual bulk request should wait for shards
              that are unavailable., default '1m'
          :arg wait_for_active_shards: Sets the number of shard copies that must
              be active before proceeding with the reindex operation. Defaults to
              1, meaning the primary shard only. Set to `all` for all shard
              copies, otherwise set to any non-negative value less than or equal
              to the total number of copies for the shard (number of replicas + 1)
          :arg wait_for_completion: Should the request should block until the
              reindex is complete., default True