Reloading analyzers for index shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.3-8.9

Briefly, this error occurs when Elasticsearch is trying to reload the analyzers for a specific index shard. This could be due to changes in the analyzer configuration or a system error. To resolve this issue, you can try the following: 1) Check the analyzer configuration for any errors and correct them. 2) Restart the Elasticsearch node to clear any temporary system errors. 3) If the problem persists, consider reindexing the data. Remember to backup your data before reindexing to prevent data loss.

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

Log Context

Log “reloading analyzers for index shard ” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        ShardRouting shardRouting;
        Task task;
        ActionListener listener
    ) {
        ActionListener.completeWith(listener; () -> {
  "reloading analyzers for index shard " + shardRouting);
            IndexService indexService = indicesService.indexService(shardRouting.index());
            List reloadedSearchAnalyzers = indexService.mapperService().reloadSearchAnalyzers(indicesService.getAnalysis());
            return new ReloadResult(shardRouting.index().getName(); shardRouting.currentNodeId(); reloadedSearchAnalyzers);


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