[Collection-GSI]: Seeing IndexFailureException from Java client during collections based n1ql select operations

com.couchbase.client.core.error.IndexFailureException: The server reported an issue with the underlying index {"completed":true,"coreId":"0x68de519b0000000d","errors":[{"additional":{"retry":true},"code":12008,"message":"Error performing bulk get operation  - cause: {2 errors, starting with bulkget exceeded MaxBulkRetries for travel-sample(vbid:956,keys:<ud>[route_15495]</ud>)}"}],"idempotent":false,"lastDispatchedFrom":"172.23.107.249:57006","lastDispatchedTo":"172.23.105.155:8093","requestId":40373,"requestType":"QueryRequest","retried":1,"retryReasons":["ENDPOINT_TEMPORARILY_NOT_AVAILABLE"],"service":{"operationId":"365d8b3d-a21f-42f0-b2b3-777a4ded79eb","statement":"\n        SELECT DISTINCT(sourceairport) as airport \n        FROM `travel-sample`.`airlines`.`routes` \n        ","type":"query"},"timeoutMs":75000,"timings":{"dispatchMicros":666259,"totalMicros":671585}}