Panic: Unexpected error in JSConverter: Expression not implemented" while creating index on where predicate

1. create sample-bucket " beer-sample"
2. create primary index
3. create index on all states with "California"
Panic: Unexpected error in JSConverter: Expression not implemented"

cbq> create index i_state on `beer-sample`(state) where state in ["California"];
{
"requestID": "ea969d10-2af6-454f-a8b8-a05602ce68ea",
"signature": null,
"results": [
],
"errors": [

{ "code": 5000, "msg": "Panic: Unexpected error in JSConverter: Expression not implemented" }

],
"status": "stopped",
"metrics":

{ "elapsedTime": "21.927257ms", "executionTime": "21.354312ms", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}
attaching logs.