Failed to build scroll entity – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch fails to create a scroll entity, which is used for retrieving large numbers of results from a search query. This could be due to a variety of reasons such as incorrect query syntax, insufficient memory, or an issue with the Elasticsearch cluster. To resolve this issue, you can check your query syntax, increase the memory allocation for Elasticsearch, or troubleshoot your Elasticsearch cluster for any potential issues.

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This guide will help you check for common problems that cause the log ” failed to build scroll entity ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: scroll, reindex.

Log Context

Log “failed to build scroll entity” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try (XContentBuilder entity = JsonXContent.contentBuilder()) {
 entity.startObject().field("scroll_id"; scroll).endObject();
 } catch (IOException e) {
 throw new ElasticsearchException("failed to build scroll entity"; e);
 return request;
 }  static Request clearScroll(String scroll; Version remoteVersion) {


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