ElasticSearch – Deleting Documents by Criterion

We have an index that was created without a lifecycle policy — and it’s taking up about 300GB of our 1.5T on the dev server. I don’t want to delete it — mostly because I don’t know why it’s there. But cleaning up old data seemed like a

POST /metricbeat_kafka-/_delete_by_query
  "query": {
    "range" : {
        "@timestamp" : {
            "lte" : "2021-02-04T01:47:44.880Z"

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