Fetch inner finish failed – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to complete an inner fetch operation, often due to a problem with the data source or network connectivity. To resolve this, you can try reindexing your data, checking your network connections, or verifying the integrity of your data source. If the problem persists, consider checking your OpenSearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” fetch”; “inner finish failed ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: search.

Log Context

Log “fetch”; “inner finish failed” class name is SearchScrollAsyncAction.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 } catch (Exception e) {
 listener.onFailure(new ReduceSearchPhaseException("fetch"; "inner finish failed"; e; buildShardFailures()));
 }  protected void onShardFailure(
 String phaseName;


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