BUG：net/http.(*persistConn) goroutine leak #110
Description
Grafana dashboards indicate a continuous increase in the Goroutine count within the Vault service.
A subsequent pprof analysis revealed a significant number of persistent HTTP connections that are not being closed.
These connections all originate from and are directed towards Elasticsearch.
The buildClient function is used for all Elasticsearch calls, but its connection pool is only configured with TLSClientConfig.
Vault Version：1.14