better logstash query: @message:"NovaException: iSCSI device not found at" AND @fields.build_status:"FAILURE" AND @fields.filename:"logs/screen-n-cpu.txt"
better logstash query: "NovaException: iSCSI device not found at" AND @fields. build_status: "FAILURE" AND @fields. filename: "logs/screen- n-cpu.txt"
@message: