如何在Elasticsearch上进行联合查询? [英] How to make union query on Elasticsearch?
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问题描述
我想用UNION和限制进行查询。
I would like to make a query with UNION and limit.
我可以在mysql上解释该查询。
I can explain that query on mysql.
(SELECT
*
FROM table
WHERE type='text'
LIMIT 3
)
UNION
(SELECT
*
FROM table
WHERE type='word'
LIMIT 3
)
我在Elasticsearch上尝试过
I tried it on Elasticsearch
{
"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,发生了错误。
http://localhost:9200/test/table/_search?pretty&source={%22query%22:{%22dis_max%22:{%22queries%22:[{%22query%22:{%22match%22:{%22type%22:%22test%22}}}]}}} Then, the error occured.
{
"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,它可以工作。
When I use only match query, it worked. But with size, it doesn't work.
我该怎么解决?
推荐答案
方法是多搜索
curl -XGET 'http://127.0.0.1:9200/indexname/_msearch' -d '
{}
{"query" : {"term" : {"type" : "text"}}, "size" : 3}
{}
{"query" : {"term" : {"type" : "word"}}, "size" : 3}
'
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