Opster Team
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 TransportService.java.
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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Jose Rafaelly
Head of System Engineering at Everymundo