实际上，您应该像这样更改映射
"os_name": { "type": "string", "fields": { "raw": { "type": "string", "index": "not_analyzed" } }},并且您的aggs应该更改为：
GET /temp/example/_search{ "size": 0, "aggs": { "OS": { "terms": {"field": "os_name.raw" } } }}
