Flex index: Upgrade:Mixed cluster: earch bleveIndexAlias, err: grpc_client: no ports found for host:

Build : 5.5.6-4733 --> 6.6.0-7781

• Setup 5.5.6-4733 cluster with n1(kv:n1ql) n2 (kv:fts) n3(kv:index) n4(kv:fts)
• Load some docs to bucket
• Create index with below:

  {"params": {"mapping": {"default_analyzer": "keyword", "default_datetime_parser": "dateTimeOptional", "default_mapping": {"default_analyzer": "keyword", "dynamic": true, "enabled": true}, "type_field": "type", "analysis": {}, "default_type": "_default", "default_field": "_all"}, "store": {"mossStoreOptions": {}, "kvStoreName": "mossStore", "indexType": "scorch"}}, "name": "default_index", "planParams": {"numReplicas": 0}, "sourceName": "default", "sourceUUID": "", "sourceType": "couchbase", "type": "fulltext-index", "sourceParams": {}, "uuid": ""}

• Remove n1 from cluster and upgrade to 6.6.0-7781
• Add this node back to the cluster with kv:n1ql:index:fts
• Running Flex query throws below error:

  [2020-06-10 14:51:00,958] - [tuq:1266] INFO - RUN QUERY select meta().id from default USE INDEX (USING FTS, USING GSI) where name = 'employee-6'

  [2020-06-10 14:51:00,958] - [rest_client:3472] INFO - query params : scan_consistency=NOT_BOUNDED&statement=select+meta%28%29.id+from+default+USE+INDEX+%28USING+FTS%2C+USING+GSI%29+where+name+%3D+%27employee-6%27

  [2020-06-10 14:51:00,967] - [rest_client:840] ERROR - POST http://172.23.97.90:8093/query?scan_consistency=NOT_BOUNDED&statement=select+meta%28%29.id+from+default+USE+INDEX+%28USING+FTS%2C+USING+GSI%29+where+name+%3D+%27employee-6%27 body: headers: {'Authorization': 'Basic QWRtaW5pc3RyYXRvcjpwYXNzd29yZA==\n'} error: 500 reason: unknown {

  "requestID": "031bc8a7-5c0c-4740-9841-f85521659068",

  "signature": {"id":"json"},

  "results": [

  ],

  "errors": [{"code":5000,"msg":"n1fty: response_handler: stream.Recv, err - cause: rpc error: code = Unavailable desc = grpc_server: Search bleveIndexAlias, err: grpc_client: no ports found for host: 172.23.97.87"}],

  "status": "errors",

  "metrics": {"elapsedTime": "4.375936ms","executionTime": "4.349128ms","resultCount": 0,"resultSize": 0,"errorCount": 1}

  } auth: Administrator:password