Failed to Insert Data into a Cluster Index

Symptom

I failed to insert data into a CSS cluster index and the error information is as follows.

Issue Analysis

When the disk usage exceeds 95%, Elasticsearch automatically sets the index to the read-only status to prevent the disk space from being used up.

Solution

• For clusters in new versions (later than 7.10.2), the read-only mode is automatically disabled after the cluster disk usage decreases. You only need to free up space or expand the disk capacity.
• For clusters in old versions, you need to manually change the index status by running the following command on Kibana:

  PUT /_all/_settings { "index.blocks.read_only_allow_delete": null }