[BUG] Failure to add Azure snapshot repository

[PaulLesur]

Describe the bug
We get 500 when we try to register an Azure storage container as a snapshots repository

To Reproduce
Follow these steps:

curl -sS -XPUT -H "Content-Type: application/json" -d '{"type":"azure","settings":{"client": "default", "container": "prod-snapshots-os"}}' http://localhost:9200/_snapshot/prod-snapshots-os;

The request returns :

{
  "error": {
    "root_cause": [
      {
        "type": "repository_verification_exception",
        "reason": "[prod-snapshots-os] cannot delete test data at "
      }
    ],
    "type": "repository_verification_exception",
    "reason": "[prod-snapshots-os] cannot delete test data at ",
    "caused_by": {
      "type": "rejected_execution_exception",
      "reason": "event executor terminated",
      "suppressed": [
        { "type": "exception", "reason": "#block terminated with an error" }
      ]
    }
  },
  "status": 500
}

Expected behavior
Get a 200.

Plugins

• azure repository plugin
• disabled: security plugin

Host/Environment (please complete the following information):

• Docker image: opensearchproject/opensearch:1.2.1
• Version 1.2.1

Aditionnal information
Even if we get an error, the repo is added to the list of repos (we can see it with a GET _cat/repositories). We are able to make snapshots successfuly.

[PaulLesur]

Probably a duplicate of #1734

[reta]

@PaulLesur yes, that is the same reason