Unknown response type expected NodeStoreFilesMetaData or FailedNodeException – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch expects a response type of either NodeStoreFilesMetaData or FailedNodeException, but receives something different. This could be due to a misconfiguration or a bug in the system. To resolve this issue, you can try the following: 1) Check your Elasticsearch configuration for any errors or inconsistencies. 2) Update your Elasticsearch version to the latest one, as this might be a bug that has been fixed in a newer version. 3) If the error persists, consider reaching out to the Elasticsearch community or support for further assistance.

This guide will help you check for common problems that cause the log ” unknown response type [{}]; expected NodeStoreFilesMetaData or FailedNodeException ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, node, response and shard.

Log Context

Log “unknown response type [{}]; expected NodeStoreFilesMetaData or FailedNodeException” classname is TransportNodesListShardStoreMetaData.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             if (resp instanceof NodeStoreFilesMetaData) { // will also filter out null response for unallocated ones
                nodeStoreFilesMetaDatas.add((NodeStoreFilesMetaData) resp);
            } else if (resp instanceof FailedNodeException) {
                failures.add((FailedNodeException) resp);
            } else {
                logger.warn("unknown response type [{}]; expected NodeStoreFilesMetaData or FailedNodeException"; resp);
        return new NodesStoreFilesMetaData(clusterName; nodeStoreFilesMetaDatas.toArray(new NodeStoreFilesMetaData[nodeStoreFilesMetaDatas.size()]);
                failures.toArray(new FailedNodeException[failures.size()]));


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