[BUG] Lock acquire/release for snapshot jobs emit warning and error logs

[spapadop]

Describe the bug

I have a simple snapshot management job running daily:

{
	"name": "daily-monit-qa-backup_v2",
	"description": "Daily snapshot policy",
	"schema_version": 19,
	"creation": {
	  "schedule": {
	    "cron": {
	      "expression": "0 12 * * *",
	      "timezone": "Europe/Zurich"
	    }
	  }
	},
	"deletion": {
	  "schedule": {
	    "cron": {
	      "expression": "0 12 * * *",
	      "timezone": "Europe/Zurich"
	    }
	  },
	  "condition": {
	    "max_age": "3d",
	    "min_count": 1
	  }
	},
	"snapshot_config": {
	  "indices": "monit_qa*",
	  "ignore_unavailable": true,
	  "repository": "s3-monitqa1-bucket",
	  "partial": true
	},
	"schedule": {
	  "interval": {
	    "start_time": 1718098008729,
	    "period": 1,
	    "unit": "Minutes"
	  }
	},
	"enabled": true,
	"last_updated_time": 1718709061300,
	"enabled_time": 1718098008729
}

Everyday it produces around 70 warning logs like:

Cannot acquire lock for snapshot management job daily-monit-qa-backup_v2

followed by 2 error logs:

Could not release lock [.opendistro-ism-config-daily-monit-qa-backup_v2-sm-policy] for daily-monit-qa-backup_v2-sm-policy.

These two error logs cause two failure notifications, if the notification channel for this is configured.

However, the snapshot has actually a "SUCCESS" status, so these logs seem rather insignificant or at least not worth further digging, as my snapshot is successful. Not sure what should happen here, I guess either "downgrade" these logs significance to "INFO" or "DEBUG", but definitely not "ERROR" as this makes the Failure notification functionality non-reliable.

Related component

Storage:Snapshots

To Reproduce

1. Create a daily snapshot policy to an s3 bucket, like the one I specify above.
2. Observe the WARN/ERROR logs emited when the snapshot is getting created accordingly.

Expected behavior

If the snapshot is successful, it should produce no ERROR logs.

Additional Details

Plugins
All default ones + repository-s3

Host/Environment (please complete the following information):

• OS: AlmaLinux
• Version 9.4

Additional context
Tested on OpenSearch v2.11.1

[dblock]

Thanks for opening this @spapadop.

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