Elasticsearch查询文档--常见API篇（附详细代码和案例图文）

在Elasticsearch中，查询文档是一个非常常见的操作。以下是一些常见的查询文档的API和相应的代码示例：

1. 查询所有文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.search(index="my_index", body={"query": {"match_all": {}}})
 
print(res['hits']['hits'])

2. 根据ID查询文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.get(index="my_index", id="my_id")
 
print(res['_source'])

3. 使用查询字符串查询文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.search(index="my_index", q="field:value")
 
print(res['hits']['hits'])

4. 分页查询文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.search(index="my_index", body={"query": {"match_all": {}}}, from_=10, size=10)
 
print(res['hits']['hits'])

5. 排序查询文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.search(index="my_index", body={"query": {"match_all": {}}}, sort='field:asc')
 
print(res['hits']['hits'])

6. 高亮查询文档

from elasticsearch import Elasticsearch
 
es = Elasticsearch("http://localhost:9200")
 
res = es.search(index="my_index", body={
    "query": {
        "match": {
            "field": "value"
        }
    },
    "highlight": {
        "fields": {
            "field": {}
        }
    }
})
 
for hit in res['hits']['hits']:
    print(hit['_id'], hit['_source'], hit['highlight'])

这些API和代码示例涵盖了查询文档的基本操作，如果需要更复杂的查询，可以使用Elasticsearch的查询DSL。