Fix ClusterBlockException

✅ Solution

ClusterBlockException in Elasticsearch usually indicates that the cluster is read-only, often due to low disk space or a high disk watermark. To resolve this, either increase disk space on data nodes or lower the cluster's disk watermark settings using the `cluster.routing.allocation.disk.watermark.low` and `cluster.routing.allocation.disk.watermark.high` cluster settings via the Elasticsearch API. After adjusting the settings, explicitly enable write operations with `PUT /_cluster/settings {"index.blocks.read_only_allow_delete": null}`.