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                # _index field 當跨多個索引執行查詢時,有時需要添加僅與某些索引相關聯的查詢子句。該**_index?**字段允許在索引文檔上進行索引的匹配。它可以在?**term**,**terms?**查詢,**aggregations**(聚合)?,?**scripts**(腳本) ,?**sorting**(排序)中使用 :? 注意 : 該**?_index?**被表現為虛擬字段 - 它不會作為實際字段添加到?**Lucene?**索引。這意味著您可以使用?**term**?或?**terms**?查詢(或任何重寫到?**term**?查詢的查詢,如?**match?**,?**query_string?**或?**simple_query_string?**查詢)?**_index**字段,但不支持?**prefix(前綴)**?,?**wildcard(通配符)**,?**regexp(正則表達式)**或?**fuzzy(模糊查詢)**。 | `# Example documents` `curl -XPUT?``'localhost:9200/index_1/my_type/1?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"text"``:?``"Document in index 1"` `}` `'` `curl -XPUT?``'localhost:9200/index_2/my_type/2?refresh=true&pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"text"``:?``"Document in index 2"` `}` `'` `curl -XGET?``'localhost:9200/index_1,index_2/_search?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"query"``: {` `"terms"``: {` `"_index"``: [``"index_1"``,?``"index_2"``]?``# 1` `}` `},` `"aggs"``: {` `"indices"``: {` `"terms"``: {` `"field"``:?``"_index"``,?``# 2` `"size"``: 10` `}` `}` `},` `"sort"``: [` `{` `"_index"``: {?``# 3` `"order"``:?``"asc"` `}` `}` `],` `"script_fields"``: {` `"index_name"``: {` `"script"``: {` `"lang"``:?``"painless"``,` `"inline"``:?``"doc[\u0027_index\u0027]"`?`# 4` `}` `}` `}` `}` `'` | | 1 | 查詢?**_index?**字段 | | 2 | 聚合?**_index?**字段 | | 3 | 在**?_index**?字段上排序 | | 4 | 在腳本中訪問?**_index?**字段 |
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