Failed to wrap searcher – 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 initialize a new searcher due to issues like insufficient memory, corrupted indices, or a heavy load on the cluster. To resolve this, you can try increasing the heap size, checking for corrupted indices and repairing them, or optimizing your queries to reduce the load on the cluster. Additionally, consider scaling your cluster horizontally by adding more nodes to distribute the load.

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

Log Context

Log “failed to wrap searcher” class name is IndexShard.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final Engine.Searcher newSearcher = wrapSearcher(searcher; fieldUsageTracker.createSession(); readerWrapper);
 assert newSearcher != null;
 success = true;
 return newSearcher;
 } catch (IOException ex) {
 throw new ElasticsearchException("failed to wrap searcher"; ex);
 } finally {
 if (success == false) {
 Releasables.closeWhileHandlingException(searcher);
 }
 }

 

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