cmd/scollector: elasticsearch: Include cluster tag in cluster health metrics.
cmd/scollector: elasticsearch: Include cluster tag in cluster health metrics.

simnv/bosun,csmith-palantir/bosun,csmith-palantir/bosun,alienth/bosun,leapar/bosun,simnv/bosun,bosun-monitor/bosun,mhenderson-so/bosun,alienth/bosun,leapar/bosun,leapar/bosun,csmith-palantir/bosun,leapar/bosun,bookingcom/bosun,bookingcom/bosun,bosun-monitor/bosun,alienth/bosun,alienth/bosun,simnv/bosun,bookingcom/bosun,simnv/bosun,alienth/bosun,bookingcom/bosun,mhenderson-so/bosun,bookingcom/bosun,mhenderson-so/bosun,mhenderson-so/bosun,bookingcom/bosun,bosun-monitor/bosun,csmith-palantir/bosun,simnv/bosun,bosun-monitor/bosun,mhenderson-so/bosun,csmith-palantir/bosun,csmith-palantir/bosun,simnv/bosun,alienth/bosun,bosun-monitor/bosun,bosun-monitor/bosun,leapar/bosun,leapar/bosun,mhenderson-so/bosun