尝试通过终端添加架构，显示以下问题。
./pinot-admin.sh AddSchema -schemaFile ../examples/batch/baseballStats/baseballStats_schema.json -exec
2022/01/12 13:41:00.627 INFO [AddSchemaCommand] [main] Executing command: AddSchema -controllerProtocol http -controllerHost 192.168.16.5 -controllerPort 9000 -schemaFile ../examples/batch/baseballStats/baseballStats_schema.json -user null -password [hidden] -exec
2022/01/12 13:41:01.389 ERROR [AddSchemaCommand] [main] Got Exception to upload Pinot Schema: baseballStats
shaded.org.apache.http.conn.HttpHostConnectException: Connect to 192.168.16.5:9000 [/192.168.16.5] failed: Connection refused (Connection refused)
