Cannot start datafeed – How to solve this Elasticsearch error

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Cannot start datafeed – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” cannot start datafeed ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”cannot start datafeed [“classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

  public void onFailure(Exception e) {
  if (ExceptionsHelper.unwrapCause(e) instanceof ResourceAlreadyExistsException) {
  logger.debug("datafeed already started"; e);
  e = new ElasticsearchStatusException("cannot start datafeed [" + params.getDatafeedId() +
  "] because it has already been started"; RestStatus.CONFLICT);


Run the Check-Up to get a customized report like this:

Analyze your cluster