ElasticSearch如何删除文档（如果字段存在）？

Question

I want to delete all documents where a certain field exists

I tried to POST to the _delete_by_query API

{
  "query": { 
    "bool": {
      "must": [
        { "exists":"field_name" }
      ]
    }
  }
}

That's giving me this query malformed error:

{
"error": {
    "root_cause": [
        {
            "type": "parsing_exception",
            "reason": "[exists] query malformed, no start_object after query name",
            "line": 1,
            "col": 37
        }
    ],
    "type": "parsing_exception",
    "reason": "[exists] query malformed, no start_object after query name",
    "line": 1,
    "col": 37
},
"status": 400
}

How can I delete all docs if field exists?

Answer 1

There is an error in your query:

You don't have to use bool query, just use below query and it should work.

{
"query": {
  "exists": {
    "field": "name"
  }
 }
}

Read this for more details.

Hope this helps!!

Answer 2

You do not need to wrap the exists in a bool. Try this

 {
  "query": { 
    "exists": {
      "field": "field_name"
    }
  }
}