Elasticsearch.Net与NEST是Elasticsearch为C#提供的两套客户端驱动，方便C#调用Elasticsearch服务接口。Elasticsearch.Net：低级别的驱动接口
NEST：高级别的驱动接口
高亮
Elasticsearch supports three highlighters: unified, plain, and fvh (fast vector highlighter). You can specify the highlighter type you want to use for each field.
NEST - High level client 7.4.2
https://www.elastic.co/guide/en/elasticsearch/client/net-api/current/nest.html
.