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Briefly, this error occurs when Elasticsearch is updating the Index Lifecycle Management (ILM) operation mode. This is not necessarily an error, but more of an informational message indicating a change in the ILM operation mode. If this is causing issues, you can resolve it by checking the current ILM policies and adjusting them as necessary. You can also manually set the ILM operation mode using the Elasticsearch API. Lastly, ensure that your Elasticsearch cluster has sufficient resources to handle the ILM operations.
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This guide will help you check for common problems that cause the log ” updating ILM operation mode to {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “updating ILM operation mode to {}” classname is OperationModeUpdateTask.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} else {
// The transition is invalid; return the current state
return currentState;
}
logger.info("updating ILM operation mode to {}"; newMode);
return ClusterState.builder(currentState)
.metadata(
Metadata.builder(currentState.metadata())
.putCustom(LifecycleOperationMetadata.TYPE; new LifecycleOperationMetadata(newMode; currentSLMMode(currentState)))
)
