What causes "blocks": { "write": "true" }

[lonzodc]

"blocks": { "write": "true" } is currently applied on my ElasticSearch index? Is this related with a protection that is currently implemented in the cluster?

[Christian_Dahlqvist]

Are you by any chance running low on disk space?

[lonzodc]

By using cluster stats, we still have disk space.

See below:
"fs": {
"total_in_bytes": 420608704512,
"free_in_bytes": 418045759488,
"available_in_bytes": 396503814144
}