操作环境
下面的程序和运行环境都是使用Laradock部署的
- Elasticsearch 7.6.1
- Kibana 7.6.1
- PHP 7.2
- elasticsearch/elasticsearch ~7.6.0
示例
导入数据
所有的DSL语句都在Kibana的Dev Tools工具中执行.
# 导入的数据取材自参考资料二
# 书籍文档信息的集合（有以下字段：title（标题）, authors（作者）, summary（摘要）, publish_date（发布日期）和 num_reviews（浏览数）
POST /bookdb_index/_bulk
{"index":{"_id":1}}
{"title":"Elasticsearch: The Definitive Guide","authors":["clinton gormley","zachary tong"],"summary":"A distibuted real-time search and analytics engine","publish_date":"2015-02-07","num_reviews":20,"publisher":"oreilly"}
{"index":{"_id":2}}
{"title":"Taming Text: How to Find, Organize, and Manipulate It","authors":["grant ingersoll","thomas morton","drew farris"],"summary":"organize text using approaches such as full-text search, proper name recognition, clustering, tagging, information extraction, and summarization","publish_date":"2013-01-24","num_reviews":12,"publisher":"manning"}
{"index":{"_id":3}}
{"title":"Elasticsearch in Action","authors":["radu gheorge","matthew lee hinman","roy russo"],"summary":"build scalable search applications using Elasticsearch without having to do complex low-level programming or understand advanced data science algorithms","publish_date":"2015-12-03","num_reviews":18,"publisher":"manning"}
{"index":{"_id":4}}
{"title":"Solr in Action","authors":["trey grainger","timothy potter"],"summary":"Comprehensive guide to implementing a scalable search engine using Apache Solr","publish_date":"2014-04-05","num_reviews":23,"publisher":"manning"}DSL
代码
# 下面这些筛选条件完全是为了举例写法才写这么多的...
GET /bookdb_index/_search
{
"query": {
"bool": {
"must": [
{
"multi_match": {
"query": "elasticsearch guide",
"fields": []
}
},
{
"match_phrase_prefix": {
"title": {
"query": "elastic",
"slop": 3,
"max_expansions": 10
}
}
},
{
"wildcard": {
"title": "elastic*"
}
},
{
"regexp": {
"title": "elastic.*ch"
}
},
{
"range": {
"num_reviews": {
"from": 10,
"to": 20,
"include_lower": true,
"include_upper": true
}
}
}
],
"must_not": [
{
"terms": {
"publish_date": [
"2015-12-04"
]
}
}
],
"should": [
{
"match": {
"publisher": "manning"
}
}
],
"filter": [
{
"exists": {
"field": "authors"
}
},
{
"range": {
"num_reviews": {
"gte": 12,
"lt": 30
}
}
}
]
}
},
"highlight": {
"fields": {
"title": {},
"summary": {}
}
},
"aggs": {
"sum_of_reviews": {
"sum": {
"field": "num_reviews"
}
},
"group_of_date": {
"terms": {
"field": "publish_date",
"size": 10
},
"aggs": {
"avg_of_reviews": {
"avg": {
"field": "num_reviews"
}
}
}
}
}
}结果
{
"took" : 17,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 5.7691345,
"hits" : [
{
"_index" : "bookdb_index",
"_type" : "book",
"_id" : "1",
"_score" : 5.7691345,
"_source" : {
"title" : "Elasticsearch: The Definitive Guide",
"authors" : [
"clinton gormley",
"zachary tong"
],
"summary" : "A distibuted real-time search and analytics engine",
"publish_date" : "2015-02-07",
"num_reviews" : 20,
"publisher" : "oreilly"
},
"highlight" : {
"title" : [
"<em>Elasticsearch</em>: The Definitive <em>Guide</em>"
]
}
},
{
"_index" : "bookdb_index",
"_type" : "book",
"_id" : "3",
"_score" : 5.2062206,
"_source" : {
"title" : "Elasticsearch in Action",
"authors" : [
"radu gheorge",
"matthew lee hinman",
"roy russo"
],
"summary" : "build scalable search applications using Elasticsearch without having to do complex low-level programming or understand advanced data science algorithms",
"publish_date" : "2015-12-03",
"num_reviews" : 18,
"publisher" : "manning"
},
"highlight" : {
"summary" : [
"build scalable search applications using <em>Elasticsearch</em> without having to do complex low-level programming"
],
"title" : [
"<em>Elasticsearch</em> in Action"
]
}
}
]
},
"aggregations" : {
"sum_of_reviews" : {
"value" : 38.0
},
"group_of_date" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : 1423267200000,
"key_as_string" : "2015-02-07T00:00:00.000Z",
"doc_count" : 1,
"avg_of_reviews" : {
"value" : 20.0
}
},
{
"key" : 1449100800000,
"key_as_string" : "2015-12-03T00:00:00.000Z",
"doc_count" : 1,
"avg_of_reviews" : {
"value" : 18.0
}
}
]
}
}
}
PHP
代码
// 要事先安装好elasticsearch/elasticsearch扩展包,注意:扩展包要匹配当前使用的Elasticsearch版本
use \Elasticsearch\ClientBuilder;
$client = ClientBuilder::fromConfig([
'hosts' => ['elasticsearch:9200'],
'retries' => 2,
'handler' => ClientBuilder::singleHandler()
]);
$search = [
// 指定索引
'index' => 'bookdb_index',
// 搜索主体
'body' => [
'query' => [
'bool' => [
// `must`里的每个条件都要满足
'must' => [
// 多字段条件
[
'multi_match' => [
'query' => 'elasticsearch guide',
// 空数组表示搜索任意字段
'fields' => []
// 也可以指定搜索那些字段
// 'fields' => ['title', 'summary']
]
],
// 短语前缀条件
[
'match_phrase_prefix' => [
// 搜索`title`字段以`elastic`开头的文档
'title' => [
'query' => 'elastic',
// 调整单词顺序和不太严格的相对位置,大概是查询的分词之间最多能容纳多少个别的词
'slop' => 3,
// 用来限制查询项的数量，降低对资源需求的强度
'max_expansions' => 10
]
]
],
// 通配符条件
[
'wildcard' => [
// `title`字段以`elastic`开头
'title' => 'elastic*'
]
],
// 正则条件
[
'regexp' => [
'title' => 'elastic.*ch'
]
],
// 范围条件
[
'range' => [
// 10≤`num_reviews`≤20
'num_reviews' => [
'from' => 10,
'to' => 20,
// 包括边界值
'include_lower' => true,
'include_upper' => true
]
]
]
],
// 必须不在`must_not`的条件范围内
'must_not' => [
[
'terms' => [
'publish_date' => ['2015-12-04']
]
]
],
// `should`里的条件只要不跟`must`和`must_not`的冲突,那满足`should`的也算(非必须满足)
'should' => [
[
'match' => [
'publisher' => 'manning'
]
]
],
// 对上面的筛选结果进行补充筛选
'filter' => [
// 要求存在`authors`字段
[
'exists' => [
'field' => 'authors'
]
],
// 范围条件的另一种写法
[
'range' => [
'num_reviews' => [
'gte' => 12,
'lt' => 30
]
]
]
]
]
],
// 返回相关部分的标记html
'highlight' => [
'fields' => [
// 键是表示要返回哪些字段的相关标记,值是空对象
'title' => new stdClass(),
'summary' => new stdClass()
]
],
// 聚合
'aggs' => [
// 符合全部条件的文件的`num_reviews`字段值的总和,这个总和以`sum_of_reviews`记录下来(这个键名是自定义的)
'sum_of_reviews' => [
'sum' => [
'field' => 'num_reviews',
]
],
// 分组
'group_of_date' => [
// 按`publish_date`字段分组
'terms' => [
'field' => 'publish_date',
'size' => 10
],
// 计算每个小组的`num_reviews`字段平均分
'aggs' => [
'avg_of_reviews' => [
'avg' => [
'field' => 'num_reviews'
]
]
]
]
]
]
];
echo '<pre>';
var_dump($client->search($search));
输出
array(5) {
["took"]=>
int(18)
["timed_out"]=>
bool(false)
["_shards"]=>
array(4) {
["total"]=>
int(1)
["successful"]=>
int(1)
["skipped"]=>
int(0)
["failed"]=>
int(0)
}
["hits"]=>
array(3) {
["total"]=>
array(2) {
["value"]=>
int(2)
["relation"]=>
string(2) "eq"
}
["max_score"]=>
float(5.7691345)
["hits"]=>
array(2) {
[0]=>
array(6) {
["_index"]=>
string(12) "bookdb_index"
["_type"]=>
string(4) "book"
["_id"]=>
string(1) "1"
["_score"]=>
float(5.7691345)
["_source"]=>
array(6) {
["title"]=>
string(35) "Elasticsearch: The Definitive Guide"
["authors"]=>
array(2) {
[0]=>
string(15) "clinton gormley"
[1]=>
string(12) "zachary tong"
}
["summary"]=>
string(50) "A distibuted real-time search and analytics engine"
["publish_date"]=>
string(10) "2015-02-07"
["num_reviews"]=>
int(20)
["publisher"]=>
string(7) "oreilly"
}
["highlight"]=>
array(1) {
["title"]=>
array(1) {
[0]=>
string(53) "Elasticsearch: The Definitive Guide"
}
}
}
[1]=>
array(6) {
["_index"]=>
string(12) "bookdb_index"
["_type"]=>
string(4) "book"
["_id"]=>
string(1) "3"
["_score"]=>
float(5.2062206)
["_source"]=>
array(6) {
["title"]=>
string(23) "Elasticsearch in Action"
["authors"]=>
array(3) {
[0]=>
string(12) "radu gheorge"
[1]=>
string(18) "matthew lee hinman"
[2]=>
string(9) "roy russo"
}
["summary"]=>
string(152) "build scalable search applications using Elasticsearch without having to do complex low-level programming or understand advanced data science algorithms"
["publish_date"]=>
string(10) "2015-12-03"
["num_reviews"]=>
int(18)
["publisher"]=>
string(7) "manning"
}
["highlight"]=>
array(2) {
["summary"]=>
array(1) {
[0]=>
string(114) "build scalable search applications using Elasticsearch without having to do complex low-level programming"
}
["title"]=>
array(1) {
[0]=>
string(32) "Elasticsearch in Action"
}
}
}
}
}
["aggregations"]=>
array(2) {
["sum_of_reviews"]=>
array(1) {
["value"]=>
float(38)
}
["group_of_date"]=>
array(3) {
["doc_count_error_upper_bound"]=>
int(0)
["sum_other_doc_count"]=>
int(0)
["buckets"]=>
array(2) {
[0]=>
array(4) {
["key"]=>
int(1423267200000)
["key_as_string"]=>
string(24) "2015-02-07T00:00:00.000Z"
["doc_count"]=>
int(1)
["avg_of_reviews"]=>
array(1) {
["value"]=>
float(20)
}
}
[1]=>
array(4) {
["key"]=>
int(1449100800000)
["key_as_string"]=>
string(24) "2015-12-03T00:00:00.000Z"
["doc_count"]=>
int(1)
["avg_of_reviews"]=>
array(1) {
["value"]=>
float(18)
}
}
}
}
}
}参考资料
下面的资料使用的Elasticsearch版本较低,有部分功能在当前7.x版本已被废弃,需要有选择地参考和使用
- ElasticSearch学习文档 这篇是基础,初学者大概了解下就好,可以当作手册使用
- 23个最有用的Elasticsearch检索技巧 这篇很重要,帮你快速上手DSL
- 《Elasticsearch: 权威指南》 基于2.x版
**粗体** _斜体_ [链接](http://example.com) `代码` - 列表 > 引用。你还可以使用@来通知其他用户。