如何在Elasticsearch上进行联合查询？

Question

我想用UNION和limit进行查询。

我可以在mysql上解释该查询。

(SELECT 
    *
FROM table
WHERE type='text'
LIMIT 3
)
UNION
(SELECT 
    *
FROM table
WHERE type='word'
LIMIT 3
)

我在Elasticsearch上尝试过

{

    "query":{
        "dis_max":{
            "queries":[
                {
                    "from":0,
                    "size":3,
                    "query":{
                        "match":{
                            "type":"text"
                        }
                    }
                },
                {
                    "from":0,
                    "size":3,
                    "query":{
                        "match":{
                            "type":"word"
                        }
                    }
                }
            ]
        }
    }

}

http：// localhost：9200 / test / table / _search？pretty＆source
=

{％22query％22：{％22dis_max％22：{％22queries％22：[{％22query％22：{％22match％22：{％22type
％22：％22test％22}}}}}}}然后，发生错误。

{
  "error" : {
    "root_cause" : [ {
      "type" : "query_parsing_exception",
      "reason" : "[_na] query malformed, no field after start_object",
      "index" : "test",
      "line" : 1,
      "col" : 34
    } ],
    "type" : "search_phase_execution_exception",
    "reason" : "all shards failed",
    "phase" : "query",
    "grouped" : true,
    "failed_shards" : [ {
      "shard" : 0,
      "index" : "test",
      "node" : "U6yIqY-pS526Vz8QTi6d0Q",
      "reason" : {
        "type" : "query_parsing_exception",
        "reason" : "[_na] query malformed, no field after start_object",
        "index" : "test",
        "line" : 1,
        "col" : 34
      }
    } ]
  },
  "status" : 400
}

当我只使用匹配查询时，它起作用了。但是随着大小的变化，它不起作用。

我该如何解决？

Answer 1

必去之路是MultiSearch

curl -XGET 'http://127.0.0.1:9200/indexname/_msearch'  -d '
{}
{"query" : {"term" : {"type" : "text"}}, "size" : 3}
{}
{"query" : {"term" : {"type" : "word"}}, "size" : 3}
'