Couldn’t convert task result to XContent for – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

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

This guide will help you check for common problems that cause the log ” Couldn’t convert task result to XContent for ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Couldn’t convert task result to XContent for [{}]”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

IndexRequestBuilder index = client.prepareIndex(TASK_INDEX).setId(taskResult.getTask().taskId().toString());
 try (XContentBuilder builder = XContentFactory.contentBuilder(Requests.INDEX_CONTENT_TYPE)) {
 taskResult.toXContent(builder; new ToXContent.MapParams(Map.of(INCLUDE_CANCELLED_PARAM; "false")));
 } catch (IOException e) {
 throw new ElasticsearchException("Couldn't convert task result to XContent for [{}]"; e; taskResult.getTask());
 doStoreResult(STORE_BACKOFF_POLICY.iterator(); index; listener);
 private void doStoreResult(Iterator backoff; IndexRequestBuilder index; ActionListener listener) {


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