How to create a must-exist query in Elasticsearch?

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To create a must-exist query in Elasticsearch, you can use the exists query. This query matches documents where a specific field exists, regardless of its value. Here's an example:

{
  "query": {
    "bool": {
      "must": [
        {
          "exists": {
            "field": "name"
          }
        }
      ]
    }
  }
}

This query will return all documents that have a non-null value for the "name" field. If you want to include additional query clauses, you can add them to the "must" array.