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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to clear the scroll context after a search operation. This could be due to a network issue, a bug in the application, or a problem with the OpenSearch cluster. To resolve this issue, you can try to manually clear the scroll context using the Clear Scroll API. If the problem persists, check the network connectivity and the health of the OpenSearch cluster. Also, ensure that your application is correctly handling scroll contexts and not leaving them open unnecessarily.

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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 OpenSearch concepts: index, scroll, reindex.

Log Context

Log “failed to build clear scroll entity” class name is We extracted the following from OpenSearch 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 OpenSearchException("failed to build clear scroll entity"; e);
 return request;


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