Unexpected failure applying – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

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Briefly, this error occurs when Elasticsearch encounters an issue while applying an operation, such as updating an index or processing a query. This could be due to a variety of reasons such as insufficient memory, corrupted data, or a bug in the Elasticsearch software. To resolve this issue, you could try increasing the memory allocation for Elasticsearch, checking your data for corruption, or updating Elasticsearch to the latest version. If the problem persists, you may need to investigate further by checking the Elasticsearch logs for more detailed error messages.

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This guide will help you check for common problems that cause the log ” unexpected failure applying [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery.

Log Context

Log “unexpected failure applying [{}]” classname is ZenDiscovery.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    }
                }

                @Override
                public void onFailure(Exception e) {
                    logger.error(() -> new ParameterizedMessage("unexpected failure applying [{}]"; reason); e);
                    try {
                        // TODO: use cluster state uuid instead of full cluster state so that we don't keep reference to CS around
                        // for too long.
                        pendingStatesQueue.markAsFailed(newClusterState; e);
                    } catch (Exception inner) {

 

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