Not able set throttling limits in AWS OpenSearch

Question

I am using AWS OpenSearch with ML model. While creating ES cluster there is no parameter as 
"cluster_manager.throttling.thresholds.delete_index" in _cluster/settings. To Deploy ML model, We have to run "plugins.ml_commons.only_run_on_ml_node": false but it is creating default "cluster_manager.throttling.thresholds.delete_index" to 50 in cluster settings under persistent parameters which eventually deletes the index automatically. To update this parameter. I am not able to adjust these cluster settings related to threshold task limits to -1 (which shall disable the task).

Example : To set throttling limit for delete-index task to -1 :

PUT _cluster/settings
{
  "persistent": {
    "cluster_manager.throttling.thresholds":{
     "delete-index" : {
       "value" : -1
    } }}.
It gives error,
{"Message":"Your request: '/_cluster/settings' payload is not allowed."}.  Can you please let me know how to disable the index deletion automatically or update delete-index param in cluster setting?

Answer

Even I am facing similar issue while working with ML models in opensearch cluster. Tried to set the throttling limits with the PUT command mentioned in the question but the same "payload not allowed" message appears. Can someone please come up with a solution to this ?

Not able set throttling limits in AWS OpenSearch

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