可以使用高亮显示，高亮显示使您能够从搜索结果中的一个或多个字段中获取高亮显示的代码段，以便向用户显示查询匹配的位置。
添加索引数据、搜索查询和搜索结果的工作示例
索引数据：

{
  "content": "The nonprofit Wikimedia Foundation provides the essential infrastructure for free knowledge. We host Wikipedia, the free online encyclopedia, created, edited, and verified by volunteers around the world, as well as many other vital community projects. All of which is made possible thanks to donations from individuals like you. We welcome anyone who shares our vision to join us in collecting and sharing knowledge that fully represents human diversity."
}

搜索查询：

{
  "query": {
    "match": {
      "content": "online"
    }
  },
  "highlight": {
    "fields": {
      "content": {}
    }
  }
}

搜索结果：

"hits": [
      {
        "_index": "65463291",
        "_type": "_doc",
        "_id": "1",
        "_score": 0.2876821,
        "_source": {
          "content": "The nonprofit Wikimedia Foundation provides the essential infrastructure for free knowledge. We host Wikipedia, the free online encyclopedia, created, edited, and verified by volunteers around the world, as well as many other vital community projects. All of which is made possible thanks to donations from individuals like you. We welcome anyone who shares our vision to join us in collecting and sharing knowledge that fully represents human diversity."
        },
        "highlight": {                      // note this
          "content": [
            "We host Wikipedia, the free <em>online</em> encyclopedia, created, edited, and verified by volunteers around the"
          ]
        }
      }
    ]