Intermittent Issue:"msg": "write tcp 172.23.100.190:9101: broken pipe from 172.23.100.190:9101 - cause: write tcp 172.23.100.190:9101: broken pipe from 172.23.100.190:9101"

1. Create a 4 node ycsb cluster. KV,Index,query on all 4 nodes.
2. Just create 1 metaindex on bucket default.
3. Start loading 20 million docs on 172.23.100.190.
4. Issue query select count(meta().id) from default where meta().id is not missing;
while data is loading on http://172.23.100.190/.
5. Sometimes we get correct answer but sometimes this error message is thrown:
cbq> select count(meta().id) from default where meta().id is not missing;
{
"requestID": "e2b56f8d-da1e-4559-ab6b-953be3dee03e",
"signature":

{ "$1": "number" }

,
"results": [

{ "$1": 0 }

],
"errors": [

{ "code": 5000, "msg": "write tcp 172.23.100.190:9101: broken pipe from 172.23.100.190:9101 - cause: write tcp 172.23.100.190:9101: broken pipe from 172.23.100.190:9101" }

],
"status": "errors",
"metrics":

{ "elapsedTime": "14.461795ms", "executionTime": "14.358218ms", "resultCount": 1, "resultSize": 31, "errorCount": 1 }

}

When I check UI at the time of error message, sometime it shows that "compacting bucket default"

Are queries not allowed during compaction?