如何解决es字段过大引起的性能问题

# Index 一本书的信息
PUT books/_doc/1
{
  "title":"Mastering ElasticSearch 5.0",
  "description":"Master the searching, indexing, and aggregation features in ElasticSearch Improve users’ search experience with Elasticsearch’s functionalities and develop your own Elasticsearch plugins",
  "author":"Bharvi Dixit",
  "public_date":"2017",
  "cover_url":"https://images-na.ssl-images-amazon.com/images/I/51OeaMFxcML.jpg"
}



#查询自动创建的Mapping
GET books/_mapping

DELETE books

优化字段

#优化字段类型
PUT books
{
      "mappings" : {
      "properties" : {
        "author" : {"type" : "keyword"},
        "cover_url" : {"type" : "keyword","index": false},
        "description" : {"type" : "text"},
        "public_date" : {"type" : "date"},
        "title" : {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword",
              "ignore_above" : 100
            }
          }
        }
      }
    }
}

#Cover URL index 设置成false，无法对该字段进行搜索
POST books/_search
{
  "query": {
    "term": {
      "cover_url": {
        "value": "https://images-na.ssl-images-amazon.com/images/I/51OeaMFxcML.jpg"
      }
    }
  }
}

#Cover URL index 设置成false，依然支持聚合分析
POST books/_search
{
  "aggs": {
    "cover": {
      "terms": {
        "field": "cover_url",
        "size": 10
      }
    }
  }
}


DELETE books

大字段

#新增 Content字段。数据量很大。选择将Source 关闭
PUT books
{
      "mappings" : {
      "_source": {"enabled": false},
      "properties" : {
        "author" : {"type" : "keyword","store": true},
        "cover_url" : {"type" : "keyword","index": false,"store": true},
        "description" : {"type" : "text","store": true},
         "content" : {"type" : "text","store": true},
        "public_date" : {"type" : "date","store": true},
        "title" : {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword",
              "ignore_above" : 100
            }
          },
          "store": true
        }
      }
    }
}


# Index 一本书的信息,包含Content
PUT books/_doc/1
{
  "title":"Mastering ElasticSearch 5.0",
  "description":"Master the searching, indexing, and aggregation features in ElasticSearch Improve users’ search experience with Elasticsearch’s functionalities and develop your own Elasticsearch plugins",
  "content":"The content of the book......Indexing data, aggregation, searching.    something else. something in the way............",
  "author":"Bharvi Dixit",
  "public_date":"2017",
  "cover_url":"https://images-na.ssl-images-amazon.com/images/I/51OeaMFxcML.jpg"
}

查询图书：解决字段过⼤大引发的性能问题

#查询结果中，Source不包含数据
POST books/_search
{}

#搜索，通过store 字段显示数据，同时高亮显示 conent的内容
POST books/_search
{
  "stored_fields": ["title","author","public_date"],
  "query": {
    "match": {
      "content": "searching"
    }
  },

  "highlight": {
    "fields": {
      "content":{}
    }
  }

}