场景
我们来搜索一下标题必须包含 “blog” 的数据,然后可以包含 “java” “hadoop” “elasticsearch” “spark”的数据
实现
组合搜索条件1
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36GET forum/article/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"title": "blog"
}
}
],
"should": [
{
"match": {
"title": "java"
}
},
{
"match": {
"title": "elasticsearch"
}
},
{
"match": {
"title": "hadoop"
}
},
{
"match": {
"title": "spark"
}
}
]
}
}
}
返回值:1
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107{
"took": 43,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 5,
"max_score": 1.4930474,
"hits": [
{
"_index": "forum",
"_type": "article",
"_id": "4",
"_score": 1.4930474,
"_source": {
"articleID": "QQPX-R-3956-#aD8",
"userID": 2,
"hidden": true,
"postDate": "2017-01-02",
"tag": [
"java",
"elasticsearch"
],
"tag_cnt": 2,
"view_cnt": 80,
"title": "this is java, elasticsearch, hadoop blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "1",
"_score": 0.80226827,
"_source": {
"articleID": "XHDK-A-1293-#fJ3",
"userID": 1,
"hidden": false,
"postDate": "2017-01-01",
"tag": [
"java",
"hadoop"
],
"tag_cnt": 2,
"view_cnt": 30,
"title": "this is java and elasticsearch blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "5",
"_score": 0.5753642,
"_source": {
"articleID": "DHJK-B-1395-#Ky5",
"userID": 3,
"hidden": false,
"postDate": "2018-12-03",
"tag": [
"elasticsearch"
],
"tag_cnt": 1,
"view_cnt": 10,
"title": "this is spark blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "3",
"_score": 0.5753642,
"_source": {
"articleID": "JODL-X-1937-#pV7",
"userID": 2,
"hidden": false,
"postDate": "2017-01-01",
"tag": [
"hadoop"
],
"tag_cnt": 1,
"view_cnt": 100,
"title": "this is elasticsearch blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "2",
"_score": 0.3971361,
"_source": {
"articleID": "KDKE-B-9947-#kL5",
"userID": 1,
"hidden": false,
"postDate": "2017-01-02",
"tag": [
"java"
],
"tag_cnt": 1,
"view_cnt": 50,
"title": "this is java blog"
}
}
]
}
}
看一下返回结果, 5条数据都返回来了, 排在第一位的数据的title是 “this is java, elasticsearch, hadoop blog”,因为这条数据满足的条件最多,所以排在第一位
权重控制
给每个条件一个权重值,boost, boost越大这个搜索条件的权重越大
现在 我们给”spark”,这个条件设置一个权重1
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39GET forum/article/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"title": "blog"
}
}
],
"should": [
{
"match": {
"title": "java"
}
},
{
"match": {
"title": "elasticsearch"
}
},
{
"match": {
"title": "hadoop"
}
},
{
"match": {
"title": {
"query": "spark",
"boost":5
}
}
}
]
}
}
}
返回值:1
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107{
"took": 8,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 5,
"max_score": 1.7260925,
"hits": [
{
"_index": "forum",
"_type": "article",
"_id": "5",
"_score": 1.7260925,
"_source": {
"articleID": "DHJK-B-1395-#Ky5",
"userID": 3,
"hidden": false,
"postDate": "2018-12-03",
"tag": [
"elasticsearch"
],
"tag_cnt": 1,
"view_cnt": 10,
"title": "this is spark blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "4",
"_score": 1.4930474,
"_source": {
"articleID": "QQPX-R-3956-#aD8",
"userID": 2,
"hidden": true,
"postDate": "2017-01-02",
"tag": [
"java",
"elasticsearch"
],
"tag_cnt": 2,
"view_cnt": 80,
"title": "this is java, elasticsearch, hadoop blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "1",
"_score": 0.80226827,
"_source": {
"articleID": "XHDK-A-1293-#fJ3",
"userID": 1,
"hidden": false,
"postDate": "2017-01-01",
"tag": [
"java",
"hadoop"
],
"tag_cnt": 2,
"view_cnt": 30,
"title": "this is java and elasticsearch blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "3",
"_score": 0.5753642,
"_source": {
"articleID": "JODL-X-1937-#pV7",
"userID": 2,
"hidden": false,
"postDate": "2017-01-01",
"tag": [
"hadoop"
],
"tag_cnt": 1,
"view_cnt": 100,
"title": "this is elasticsearch blog"
}
},
{
"_index": "forum",
"_type": "article",
"_id": "2",
"_score": 0.3971361,
"_source": {
"articleID": "KDKE-B-9947-#kL5",
"userID": 1,
"hidden": false,
"postDate": "2017-01-02",
"tag": [
"java"
],
"tag_cnt": 1,
"view_cnt": 50,
"title": "this is java blog"
}
}
]
}
}
可以看到,搜索结果中包含spark的这个document排到了最前面, es在计算 relevance score 的时候,匹配权重更大的搜索条件的document,relevance score会更高,当然也会优先返回回来
默认情况下,所有的搜索条件的权重都是1