问题 I am running this query against AWS Elasticsearch 5.1 and getting a malformed query error. Here is the body of the request. I am basically just checking if the field exists during the time range. { "query": { "bool": { "filter": { "bool": { "must": [ { "range": { "@timestamp": { "gt": "2017-03-21T15:37:08.595919Z", "lte": "2017-04-21T15:52:08.595919Z" } } }, { "query": [ { "query_string": { "query": "_exists_: $event.supplier" } } ] } ] } } } }, "sort": [ { "@timestamp": { "order": "asc" } }