fun request(): Request

  /**
   * Immediately and violently release resources held by this event source. This does nothing if
   * the event source has already been closed or canceled.
   */
  fun cancel()

  fun interface Factory {
    /**
     * Creates a new event source and immediately returns it. Creating an event source initiates an

        startAnotherThread()
      }
    }
  }

  /**
   * Returns an immediately-executable task for the calling thread to execute, sleeping as necessary
   * until one is ready. If there are no ready queues, or if other threads have everything under
   * control this will return null. If there is more than a single task ready to execute immediately
   * this will start another thread to handle that work.
   */

  override fun clone(): Call = RealCall(client, originalRequest, forWebSocket)

  override fun request(): Request = originalRequest

  /**
   * Immediately closes the socket connection if it's currently held. Use this to interrupt an
   * in-flight request from any thread. It's the caller's responsibility to close the request body

### Canceling a Call ([.kt][CancelCallKotlin], [.java][CancelCallJava])

                response = client.prepareIndex()
                        .setIndex(index)
                        .setSource(new DocMap(source))
                        .setRefreshPolicy(RefreshPolicy.IMMEDIATE)
                        .setOpType(OpType.CREATE)
                        .execute()
                        .actionGet(fessConfig.getIndexIndexTimeout());
            } else {
                // create or update