Elasticsearch-terms搜索及结果优化

测试数据：

POST /forum/article/_bulk
{ "index": { "_id": 1 }}
{ "articleID" : "XHDK-A-1293-#fJ3", "userID" : 1, "hidden": false, "postDate": "2017-01-01" }
{ "index": { "_id": 2 }}
{ "articleID" : "KDKE-B-9947-#kL5", "userID" : 1, "hidden": false, "postDate": "2017-01-02" }
{ "index": { "_id": 3 }}
{ "articleID" : "JODL-X-1937-#pV7", "userID" : 2, "hidden": false, "postDate": "2017-01-01" }
{ "index": { "_id": 4 }}
{ "articleID" : "QQPX-R-3956-#aD8", "userID" : 2, "hidden": true, "postDate": "2017-01-02" }

POST /forum/article/_bulk
{ "update": { "_id": "1"} }
{ "doc" : {"tag" : ["java", "hadoop"]} }
{ "update": { "_id": "2"} }
{ "doc" : {"tag" : ["java"]} }
{ "update": { "_id": "3"} }
{ "doc" : {"tag" : ["hadoop"]} }
{ "update": { "_id": "4"} }
{ "doc" : {"tag" : ["java", "elasticsearch"]} }

搜索articleID=KDKE-B-9947-#kL5或者QQPX-R-3956-#aD8的doc

GET /forum/article/_search
{
"query": {
"constant_score": {
"filter": {
"terms": {
"articleID": [
"KDKE-B-9947-#kL5",
"QQPX-R-3956-#aD8"
]
}
}
}
}
}

搜索tags中有java的帖子

GET /forum/article/_search
{
"query": {
"constant_score": {
"filter": {
"terms": {
"tag": ["java"]
}
}
}
}
}

对搜索到的结果进行优化，只想搜索到tag中只有java的doc：

POST /forum/article/_bulk
{ "update": { "_id": "1"} }
{ "doc" : {"tag_cnt" : 2} }
{ "update": { "_id": "2"} }
{ "doc" : {"tag_cnt" : 1} }
{ "update": { "_id": "3"} }
{ "doc" : {"tag_cnt" : 1} }
{ "update": { "_id": "4"} }
{ "doc" : {"tag_cnt" : 2} }

添加一个字段表示tag中的数量

GET /forum/article/_search
{
"query": {
"constant_score": {
"filter": {
"bool": {
"must": [
{
"terms": {
"tag": ["java"]
}
},
{
"term": {
"tag_cnt": 1
}
}
]
}
}
}
}
}

就可以查询出我们想要的结果