Created ML annotations index and aliases – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.8

Briefly, this error occurs when Elasticsearch Machine Learning (ML) feature creates an annotations index and aliases. This is not an error but an informational message indicating that the ML annotations index and its aliases were successfully created. This is part of the normal operation of Elasticsearch ML. No action is required unless you encounter issues with ML operations. If you do, check the health of your Elasticsearch cluster, ensure you have sufficient resources, and verify the correct configuration of your ML jobs.

This guide will help you check for common problems that cause the log ” Created ML annotations index and aliases ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, plugin, aliases.

Log Context

Log “Created ML annotations index and aliases” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        if (event.localNodeMaster() && isIndexCreationInProgress.compareAndSet(false; true)) {
            AnnotationIndex.createAnnotationsIndexIfNecessary(client; event.state(); ActionListener.wrap(
                r -> {
                    if (r) {
              "Created ML annotations index and aliases");
                e -> {
                    logger.error("Error creating ML annotations index or aliases"; e);


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