Fix ClusterBlockException

✅ Solution

ClusterBlockException errors in Elasticsearch usually indicate that the cluster is in a read-only state, often due to low disk space. To resolve this, increase available disk space on the data nodes, or temporarily disable the read-only setting using the cluster update settings API: `PUT /_cluster/settings {"index.blocks.read_only_allow_delete": null}` (remember to address the root cause later).