Elasticsearch gives below error:

Config: Error 403 Forbidden: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];: [cluster_block_exception] blocked by:   [FORBIDDEN/12/index read-only / allow delete (api)];

This error may happen when server storage is totally full and elasticsearch puts your indexes in read only mode. If you have enough
space now and are sure there is no other matter for elasticsearch and it behaves normally, remove read only mode from index block:

curl -XPUT -H "Content-Type: application/json" http://localhost:9200/.monitoring-*/_settings -d '{"index.blocks.                       read_only_allow_delete": null}'

#elasticsearch #read_only #index #cluster_block_exception