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

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch fails to clear the scroll context, which is used for scrolling through large sets of results. This could be due to an invalid scroll ID or a server-side issue. To resolve this, ensure that the scroll ID is correct and valid. If the issue persists, check the server logs for any underlying issues. You may also need to increase the server resources if the server is overloaded. Additionally, ensure that the Elasticsearch version is up-to-date as this could be a bug in an older version.

This guide will help you check for common problems that cause the log ” failed to build clear 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 clear 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().array("scroll_id"; scroll).endObject();
 } catch (IOException e) {
 throw new ElasticsearchException("failed to build clear scroll entity"; e);
 return request;


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