SCBC-487: Ensure flexIndex TransactionsQueryOption is passed into CoreOptions

The flexIndex option is now passed into the CoreQueryOptions so the
value is now honoured.

Change-Id: I22ab0bef9d8ba9a871f4b8b12b4a2e9d0c2b4fff
Reviewed-on: https://review.couchbase.org/c/couchbase-jvm-clients/+/227982
Tested-by: Build Bot <[email protected]>
Reviewed-by: <[email protected]>
Reviewed-by: Graham Pople <[email protected]>
(cherry picked from commit 71b4024)
Reviewed-on: https://review.couchbase.org/c/couchbase-jvm-clients/+/228349
Reviewed-by: Will Broadbelt <[email protected]>

Author: willbroadbelt

scala-client/src/main/scala/com/couchbase/client/scala/transactions/TransactionQueryOptions.scala

@@ -217,7 +217,8 @@ case class TransactionQueryOptions private (
       adhoc,
       deferredException,
       None,
-      raw
+      raw,
+      flexIndex
     )
     converted.toCore
   }