Elasticsearch 查询：获取前缀与查询匹配的所有结果，以实现预输入、自动完成功能

Question

query
what is my name
what is google
what is Whosebug
how to search

所以，我想要一个包含上述文档的 Elasticsearch 索引。我想获取前缀与查询匹配的所有结果。例如，当查询“what is”时，我需要 {"what is my name", "what is google", "what is Whosebug"} 作为结果，精确前缀匹配。

如何创建索引？和示例查询（如果可能）。

提前致谢。

Answer 1

有multiple ways to achieve what you want, but simplest is to use the prefix query，如果你直接将数据索引到Elasticsearch而不定义映射，它会自动为你创建两个字段，在.keyword字段上你可以使用前缀查询作为如下所示。

索引示例文档

PUT <your-es-index>/_doc/1

{
    "title" : "what is my name"
}

PUT <your-es-index>/_doc/2

{
    "title" : "what is google"
}

PUT <your-es-index>/_doc/3

{
    "title" : "what is Whosebug"
}

PUT <your-es-index>/_doc/4

{
    "title" : "how to search"
}

搜索查询

POST /_search

{
    "query": {
        "prefix": {
            "title.keyword": {
                "value": "what is"
            }
        }
    }
}

您预期的搜索结果

"hits": [
            {
                "_index": "72391510",
                "_id": "1",
                "_score": 1.0,
                "_source": {
                    "title": "what is my name"
                }
            },
            {
                "_index": "72391510",
                "_id": "2",
                "_score": 1.0,
                "_source": {
                    "title": "what is google"
                }
            },
            {
                "_index": "72391510",
                "_id": "3",
                "_score": 1.0,
                "_source": {
                    "title": "what is Whosebug"
                }
            }

Elasticsearch 查询：获取前缀与查询匹配的所有结果，以实现预输入、自动完成功能

Elasticsearch query: Fetch all the results which prefix matches the query for typeahead, autocomplete feature

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