ElasticSearch in read-only (was: Many errors in Sidekiq)

Server administration Troubleshooting
#1

Since few days, I have many errors in Sidekiq. Like ~600 / hour.
Here is a screenshot : https://i.postimg.cc/J7jnGFR8/image.png

Any idea what is hapening with my instance?

EDIT : I think I found the reason (Import Job failed every Day · Issue #14672 · tootsuite/mastodon · GitHub).
Now searching for a solution.

#2

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