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OpenSearch: Cluster Blocks Read-Only

  • OpenSearch can enforce read-only states on clusters or indices to protect against issues like low disk space or cluster instability.
  • Steps to resolve the 'cluster.blocks.read_only' setting: Free up disk space, Clear the read-only block.
  • Steps to resolve index-level read-only block: Identify the affected indices, Clear the block for an individual index or for multiple indices using a wildcard.
  • Steps to resolve the 'cluster.blocks.read_only_allow_delete' block: Free up disk space, Clear the read_only_allow_delete block.
  • Steps to resolve index-level read-only delete block: Check index settings, Remove the block for a specific index or for all indices.
  • Understanding and resolving read-only blocks in OpenSearch is crucial for restoring normal operations.

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