_souce禁用，如何搜索? 指定_souce存储的字段？控制从_source返回部分字段？

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事实上，_source 字段就是一个储存字段。
在 Elasticsearch 中，单独设置储存字段不是一个好做法。完整的文档已经被保存在 _source 字段中。
通常最好的办法会是使用 _source 参数来过滤你需要的字段。

_source禁用，如何搜索到字段值？

必须设置所有字段：store：true
如果mapping中，对于某个type，设置了 “_source”: {“enabled”: false}，那么查询结果中就没有_source字段只能查到文档id。

如果mapping中，field设置了store为true，例如 “age”:{“type”:”integer”,”store”:true}，那么就可以在查询时通过指定fields获取到指定的field的数据。

store默认false。

fielddata_fields 和 fields区别？
fielddata_fields同时还返回_source, fields不返回_source。

field data fields(fielddata_fields) can work on fields that are not stored(from _source),will cause the terms for that field to be loaded to memory (cached),
fields parameter（fields） is about fields that are explicitly marked as stored in the mapping, which is off by default and generally not recommended.

https://www.elastic.co/guide/en/elasticsearch/reference/2.1/search-request-fielddata-fields.html
https://www.elastic.co/guide/en/elasticsearch/reference/2.1/search-request-fields.html

REST:
https://www.elastic.co/guide/en/elasticsearch/reference/2.1/search-request-fields.html

{    "fields" : ["user", "postDate"],    "query" : {        "term" : { "user" : "kimchy" }    }}

Java API

SearchRequestBuilder类方法：addFields(String... fields)或：addField(String field)

建索引时，指定_souce存储的字段？

默认存储所有字段

PUT logs{  "mappings": {    "event": {      "_source": {        "includes": [          "*.count",          "meta.*"        ],        "excludes": [          "meta.description",          "meta.other.*"        ]      }    }  }}

控制从_source返回部分字段

GET /_search{    "query":   { "match_all": {}},    "_source": [ "title", "created" ]}//支持通配符{    "_source": "obj.*",    "query" : {        "term" : { "user" : "kimchy" }    }}{    "_source": [ "obj1.*", "obj2.*" ],    "query" : {        "term" : { "user" : "kimchy" }    }}{    "_source": {        "include": [ "obj1.*", "obj2.*" ],        "exclude": [ "*.description" ]    },    "query" : {        "term" : { "user" : "kimchy" }    }}

PUT demo{   "mappings": {      "mytype": {         "_source": {            "enabled": false         },         "_all": {            "enabled": false         },         "properties": {            "store": {               "store": true,               "type": "long"            },            "nostore": {               "type": "long"            },            "date": {               "type": "date"            }         }      }   }}POST demo/mytype{    "store":11,    "nostore":12,    "date":"2006-12-14"}GET demo/mytype/_search{    "fields":[ "store","nostore","date" ]}GET demo/mytype/_search{    "fielddata_fields":[ "store","nostore","date" ]}

script

Elasticsearch增删改查之 —— Update更新
批量更新：
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html
Elasticsearch’s Update_by_query: Update Multiple Documents Simultaneously【ES 2.3】
https://qbox.io/blog/elasticsearch-update_by_query-multiple-documents-simultaneously
Query DSL » Specialized queries » Script Query
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-script-query.html

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