多文档API
- 多获取API Get API
#获取一个类型的多个文档，有多种API写法，如下：
#1
curl -XGET ‘localhost:9200/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_index" : "test", "_type" : "type", "_id" : "1" }, { "_index" : "test", "_type" : "type", "_id" : "2" } ] } ‘
#2
curl -XGET ‘localhost:9200/test/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_type" : "type", "_id" : "1" }, { "_type" : "type", "_id" : "2" } ] } ‘ #3
curl -XGET ‘localhost:9200/test/type/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_id" : "1" }, { "_id" : "2" } ] } ‘ #4
curl -XGET ‘localhost:9200/test/type/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "ids" : ["1", "2"] } ‘
#_type字段可选，如果没有指定type，则默认第一个类型中满足条件的id文档作为返回结果，下面的例子中，返回两个相同的结果
curl -XGET ‘localhost:9200/test/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "ids" : ["1", "1"] } ‘
#可以明确指定不同的类型
curl -XGET ‘localhost:9200/test/_mget/?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_type":"typeA", "_id" : "1" }, { "_type":"typeB", "_id" : "1" } ] } ‘
#过滤_source
curl -XGET ‘localhost:9200/_mget?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_index" : "test", "_type" : "type", "_id" : "1", "_source" : false }, { "_index" : "test", "_type" : "type", "_id" : "2", "_source" : ["field3", "field4"] }, { "_index" : "test", "_type" : "type", "_id" : "3", "_source" : { "include": ["user"], "exclude": ["user.location"] } } ] } ‘
#指定stored_field字段返回 1 返回 field1，field2,2返回field3，field4
curl -XGET ‘localhost:9200/test/type/_mget?stored_fields=field1,field2&pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_id" : "1" }, { "_id" : "2", "stored_fields" : ["field3", "field4"] } ] } ‘
#指定routing
curl -XGET ‘localhost:9200/_mget?routing=key1&pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs" : [ { "_index" : "test", "_type" : "type", "_id" : "1", "routing" : "key2" }, { "_index" : "test", "_type" : "type", "_id" : "2" } ] } ‘
- 批量API Bulk API 提高索引效率
批量操作在写法上需要注意的事项：换行\n结尾； 回车\r ；开始 Content-Type头部应该被设置为application/x-ndjson；
支持的参数：version_type;routing;wait_for_active_shards;refresh;
update操作支持的动作参数：retry_on_conflict;doc;doc_as_upsert;script;lang;source.
#批量操作数据结构
action_and_meta_data \ n
optional_source \ n
action_and_meta_data \ n
optional_source \ n
....
action_and_meta_data \ n
optional_source \ n
curl -XPOST ‘localhost:9200/_bulk?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "index" : { "_index" : "test", "_type" : "type1", "_id" : "1" } } { "field1" : "value1" } { "delete" : { "_index" : "test", "_type" : "type1", "_id" : "2" } } { "create" : { "_index" : "test", "_type" : "type1", "_id" : "3" } } { "field1" : "value3" } { "update" : {"_id" : "1", "_type" : "type1", "_index" : "test"} } { "doc" : {"field2" : "value2"} } ‘
curl -XPOST ‘localhost:9200/_bulk?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "update" : {"_id" : "1", "_type" : "type1", "_index" : "index1", "retry_on_conflict" : 3} } { "doc" : {"field" : "value"} } { "update" : { "_id" : "0", "_type" : "type1", "_index" : "index1", "retry_on_conflict" : 3} } { "script" : { "source": "ctx._source.counter += params.param1", "lang" : "painless", "params" : {"param1" : 1}}, "upsert" : {"counter" : 1}} { "update" : {"_id" : "2", "_type" : "type1", "_index" : "index1", "retry_on_conflict" : 3} } { "doc" : {"field" : "value"}, "doc_as_upsert" : true } { "update" : {"_id" : "3", "_type" : "type1", "_index" : "index1", "_source" : true} } { "doc" : {"field" : "value"} } { "update" : {"_id" : "4", "_type" : "type1", "_index" : "index1"} } { "doc" : {"field" : "value"}, "_source": true} ‘
- Term vectors 返回特定文档信息中的术语信息和统计信息
#示例
curl -XGET ‘localhost:9200/twitter/tweet/1/_termvectors?pretty‘
#可以指定要检索的字段
curl -XGET ‘localhost:9200/twitter/tweet/1/_termvectors?fields=message&pretty‘
返回字段包含：term infomation,term statistics,field statistics。默认返回：term infomation和field statistics。
term infomation:1.字段的term频率；2.term 位置；3.开始和结束偏移量；4.term 有效负载 即使没保存也可以计算。
term statistics :1.术语在总文档中出现的频次 2.包含当前术语的总文档数
field statistics ： 1.包含该字段的文档数doc_count 2.该字段中所有term的文档总频次 sum_doc_freq 3.该term中每个term的总频次 sum_ttf
- multi term vectors 一次性取回多个termvectors
curl -XPOST ‘localhost:9200/_mtermvectors?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "docs": [ { "_index": "twitter", "_type": "tweet", "_id": "2", "term_statistics": true }, { "_index": "twitter", "_type": "tweet", "_id": "1", "fields": [ "message" ] } ] } ‘
- Search API
查询API通常是多文档 多类型的，除explain api
查询API可指定多个routing，用“，”隔开
自适应副本选择：代替循环查询副本的方式，将请求发送到被认为是最佳的分片上：
- Response time of past requests between the coordinating node and the node containing the copy of the data
- Time past search requests took to execute on the node containing the data
- The queue size of the search threadpool on the node containing the data
统计信息组：search 与信息统计组关联，每个统计组包含其统计聚合
全局搜索超时：search.default_search_timeout 在集群更新中设置，设置为-1时，即不超时
搜索任务取消：task cancell中取消搜索任务
#指定routing
curl -XPOST ‘localhost:9200/twitter/tweet/_search?routing=kimchy&pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "query": { "bool" : { "must" : { "query_string" : { "query" : "some query string here" } }, "filter" : { "term" : { "user" : "kimchy" } } } } } ‘
#动态集群设置，自适应分片选择参数为true，默认为false
curl -XPUT ‘localhost:9200/_cluster/settings?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "transient": { "cluster.routing.use_adaptive_replica_selection": true } } ‘
#与统计信息组做关联
curl -XPOST ‘localhost:9200/_search?pretty‘ -H ‘Content-Type: application/json‘ -d‘ { "query" : { "match_all" : {} }, "stats" : ["group1", "group2"] } ‘