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Briefly, this error occurs when an index and an alias in OpenSearch share the same name. This can cause confusion and operational issues. To resolve this, you can either rename the index or the alias to ensure they have unique names. Alternatively, you can delete the dangled index if it’s no longer needed. It’s also important to review your index and alias creation processes to prevent this issue from recurring in the future.
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This guide will help you check for common problems that cause the log ” ignoring dangled index [{}] on node [{}] due to an existing alias with the same name ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node, alias, dangled, index.
Log Context
Log “ignoring dangled index [{}] on node [{}] due to an existing alias with the same name” classname is LocalAllocateDangledIndices.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
}
if (currentState.metadata().hasIndex(indexMetadata.getIndex().getName())) {
continue;
}
if (currentState.metadata().hasAlias(indexMetadata.getIndex().getName())) {
logger.warn("ignoring dangled index [{}] on node [{}] due to an existing alias with the same name";
indexMetadata.getIndex(); request.fromNode);
continue;
}
importNeeded = true;
