Invalid action name – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Invalid action name ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: ping.

Log Context

Log “invalid action name [” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void validateActionName(String actionName) {
        // TODO we should makes this a hard validation and throw an exception but we need a good way to add backwards layer
        // for it. Maybe start with a deprecation layer
        if (isValidActionName(actionName) == false) {
            logger.warn("invalid action name [" + actionName + "] must start with one of: " +
                TransportService.VALID_ACTION_PREFIXES );



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