Completion Suggester

最新推荐文章于 2024-12-04 21:31:49 发布

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最新推荐文章于 2024-12-04 21:31:49 发布

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分类专栏： Elasticsearch 读书笔记

本文链接：https://blog.youkuaiyun.com/hot_summery/article/details/100669937

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本文深入探讨了Elasticsearch中Completion Suggester的功能，包括基本的CompletionSuggester使用方法，以及如何通过Context增强搜索建议的相关性。通过具体实例展示了如何定义Mapping，索引数据，运行suggest查询获取搜索建议，以及如何利用Category和Geo Context实现更精准的上下文建议。

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————Completion Suggester——————

定义Ｍapping,使用“completion"type;
索引数据
运行”suggest“查询，得到搜索建议

DELETE articles

PUT articles
{
"mappings": {
"properties": {
"title_completion":{
"type": "completion"
}
}
}
}

POST articles/_bulk
{"index":{}}
{"title_completion":"luncene is very cool"}
{"index":{}}
{"title_completion":"Elasticsearch builds on top of luncene"}
{"index":{}}
{"title_completion":"Elasticsearch rocks"}
{"index":{}}
{"title_completion":"elastic is the company behind ELK stack"}
{"index":{}}
{"title_completion":"Elk stack rocks"}
{"index":{}}
{"title_completion":"elasticsearch is rock solid"}

POST articles/_search
{
"size": 0,
"suggest": {
"article-suggester": {
"prefix": "elk",
"completion": {
"field": "title_completion"
}
}
}
}

————Completion Suggester By Context ——————

可以定义两种类型的Context

Category —— 任一的字符串

Geo —— 地理位置信息

实现Context Suggester的具体步骤

定制一个Mapping

索引数据，并且为每个文档加入Context信息

结合Context进行Suggestion 查询

PUT comments

PUT comments/_mapping
{
"properties": {
"comment_autocomplete":{
"type":"completion",
"contexts":{
"type":"category",
"name":"comment_category"
}
}
}
}

POST comments/_doc
{
"comment":"I love the star war movies",
"comment_autocomplete":{
"input":["star wars"],
"contexts":{
"comment_category":"movies"
}
}
}

POST comments/_doc
{
"comment":"Where I find a Starbucks",
"comment_autocomplete":{
"input":["starbucks"],
"contexts":{
"comment_category":"coffee"
}
}
}

POST comments/_search
{
"suggest": {
"mamj_suggestion": {
"prefix": "sta",
"completion":{
"field":"comment_autocomplete",
"contexts":{
"comment_category":"coffee"
}
}
}
}
}