AWS ElasticSearchService index_create_block_exception
According to AWS, the above exception is being thrown due to a low memory in disks.
For t2 instances, when the JVMMemoryPressure metric exceeds 92%, Amazon ES triggers a protection mechanism by blocking all write operations to prevent the cluster from getting into red status. When the protection is on, write operations will fail with a ClusterBlockException error, new indexes cannot be created, and the IndexCreateBlockException error will be thrown.
I'm afraid the issue is still on.