Cannot use collapse in a scroll context – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when you try to use the `collapse` feature in a scroll context in Elasticsearch. The `collapse` feature is used to collapse search results based on a certain field, while scroll is used for retrieving large numbers of results. Elasticsearch does not support using these two features together. To resolve this issue, you can either remove the `collapse` feature from your query or stop using scroll and paginate your results instead. Alternatively, you could perform the collapsing operation in your application code after retrieving the results.

This guide will help you check for common problems that cause the log ” cannot use `collapse` in a scroll context ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, scroll.

Log Context

Log “cannot use `collapse` in a scroll context” class name is SearchService.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 context.storedFieldsContext(source.storedFields());
 }  if (source.collapse() != null) {
 if (context.scrollContext() != null) {
 throw new SearchException(shardTarget; "cannot use `collapse` in a scroll context");
 }
 if (context.rescore() != null && context.rescore().isEmpty() == false) {
 throw new SearchException(shardTarget; "cannot use `collapse` in conjunction with `rescore`");
 }
 final CollapseContext collapseContext = source.collapse().build(searchExecutionContext);

 

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