DSL query for indices not receiving any documents for the past 5 mins

Elastic Stack Elasticsearch
1

Hello,

We want to set up an alert using opendistro for indices not receiving any docs for the past 5 mins. I used the must_not exist field "@timestamp" since it always exists in all documents but i get no results.. Does anyone have any workaround? I intentionally stopped logstash to stop sending events to the indices but im getting 0 hits for the below query. Any help would be greatly appreciated!

{
    "size": 0,
    "query": {
        "bool": {
            "filter": [
                {
                    "range": {
                        "@timestamp": {
                            "from": "{{period_end}}||-5m",
                            "to": "{{period_end}}",
                            "include_lower": true,
                            "include_upper": true,
                            "format": "epoch_millis",
                            "boost": 1
                        }
                    }
                }
            ],
            "must_not": [
                {
                    "exists": {
                        "field": "@timestamp",
                        "boost": 1
                    }
                }
            ],
            "adjust_pure_negative": true,
            "boost": 1
        }
    },
    "aggregations": {}
}
2

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