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Briefly, this error occurs when OpenSearch is unable to find a matching index template for a data stream. This could be due to the template being deleted, renamed, or not restored properly after a backup. To resolve this issue, you can check if the template exists and is correctly named. If it doesn’t exist, you need to create a new one. If it’s incorrectly named, rename it. If it’s not restored properly, restore it again. Also, ensure that the template matches the data stream’s naming pattern.
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This guide will help you check for common problems that cause the log ” couldn’t find any matching template for data stream [{}]. has it been restored (and possibly renamed) ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: admin, indices, template.
Log Context
Log “couldn’t find any matching template for data stream [{}]. has it been restored (and possibly renamed)” classname is GetDataStreamAction.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
String ilmPolicyName = null;
if (indexTemplate != null) {
Settings settings = MetadataIndexTemplateService.resolveSettings(state.metadata(); indexTemplate);
ilmPolicyName = settings.get("index.lifecycle.name");
} else {
logger.warn("couldn't find any matching template for data stream [{}]. has it been restored (and possibly renamed)" +
"from a snapshot?"; dataStream.getName());
}
ClusterStateHealth streamHealth = new ClusterStateHealth(state;
dataStream.getIndices().stream().map(Index::getName).toArray(String[]::new));
dataStreamInfos.add(new Response.DataStreamInfo(dataStream; streamHealth.getStatus(); indexTemplate));
