Problem With Catalogsearch_fulltext Re-Indexing On Magento 2

If you try to index a document in ElasticSearch or try to re-indexing Magento 2 and you see an error message like this

php bin/magento indexer:reindex catalogsearch_fulltext Catalog Search indexer process unknown error: {"error":{"root_cause":[{"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"}],"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"},"status":403}

The problem is with ElasticSearch, namely that less than 5% of free space is left on the disk. In order for everything to work, except for releasing the required number of bytes, you still need to run the following command:

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

The underlying reason that caused ElasticSearch to lock writes to the index caused by exceeding the disk watermark/quota.

See How to disable ElasticSearch disk quota / watermark for details on how to work around that.


StackOverflow solution by Imran273


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