Finished migrating feature indices – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.16-8.9

Briefly, this error occurs when Elasticsearch has completed the process of migrating feature indices. This is not an error message but an informational message indicating that a certain operation has been successfully completed. If you see this message, it means that the migration of feature indices has been done successfully. No action is required unless you’re experiencing issues with your indices. If you are, consider checking your migration logs for any warnings or errors, or verify the health and status of your indices.

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

Log Context

Log “finished migrating feature indices” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void prepareNextIndex(ClusterState clusterState; Consumer listener; String lastFeatureName) {
        synchronized (migrationQueue) {
            assert migrationQueue != null;
            if (migrationQueue.isEmpty()) {
      "finished migrating feature indices");


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