Elasticsearch self-study notes - learn grammar from scratch

1. Query

1. Query all indexes

get /_cat/indices?v

2. Query (match_all) all documents

get /movie/_search

1.匹配所有的文档
{
    "query": {
        "match_all": {}
    }
}

2.匹配所有的文档且限制条数（其中如果未指定size，默认为10）
{
    "query": {
        "match_all": {}
    },
    "size": 1
}

3.匹配所有的文档且限制条数与游标，取出固定位置的几个数据
{
    "query": {
        "match_all": {}
    },
    "from": 10,
    "size": 5
}

4.匹配所有的文档，按照某个值排序，限制条数与游标
{
    "query": {
        "match_all": {}
    },
    "from": 10,
    "size": 5,
    "sort": {
        "balance": {
            "age": "desc"
        }
    }
}

5.匹配文档返回固定字段，在source中添加
{
    "query": {
        "match_all": {}
    },
    "_source": [
        "title",
        "description"
    ],
    "from": 10,
    "size": 5
}

3. Match query (match) searches for a specific field or a set of fields

 (Solve the problem that the match query is cut into words, it is very clear about  the difference between term and match in es - short book )

1.搜索字段中包含关键字或值等于的情况
{
    "query": {
        "match": {
            "age": 24
        }
    }
}

2.搜索字段中包含【动态sql】或者【电商】的文档
{
    "query": {
        "match": {
            "title": "动态sql 电商"
        }
    }
}

4. Boolean query:

1.基础布尔查询
{
    "query": {
        "bool": {
            "must": [
                {"match": {"title": "画棵樱花树"}},
                {"match": {"title": "送给自己吧"}}
            ]
        }
    }
}

2.布尔查询必须包含和不能包含
{
    "query": {
        "bool": {
            "must": [
                {"match": {"title": "画棵樱花树"}},
                {"match": {"title": "送给自己吧"}}
            ],
            "must_not": [
                {"match": {"title": "单恋"}},
                {"match": {"title": "双重树结构"}}
            ]
        }
    }
}

3.