Couchbase.Core.Exceptions.KeyValue.SendQueueFullException: The operation send queue is full.
   at Couchbase.Utils.ThrowHelper.ThrowSendQueueFullException()
   at Couchbase.Core.IO.Connections.Channels.ChannelConnectionPool.SendAsync(IOperation operation, CancellationToken cancellationToken)
   at Couchbase.Core.ClusterNode.<>c.<ExecuteOp>b__128_0(IOperation op2, Object state, CancellationToken effectiveToken)
   at Couchbase.Core.ClusterNode.ExecuteOp(Func`4 sender, IOperation op, Object state, CancellationTokenPair tokenPair)
   at Couchbase.Core.ClusterNode.SendAsyncWithCircuitBreaker(IOperation op, CancellationTokenPair tokenPair)
   at Couchbase.CouchbaseBucket.SendAsync(IOperation op, CancellationTokenPair tokenPair)
   at Couchbase.Core.Retry.RetryOrchestrator.RetryAsync(BucketBase bucket, IOperation operation, CancellationTokenPair tokenPair)
   at Couchbase.Core.Retry.RetryOrchestrator.RetryAsync(BucketBase bucket, IOperation operation, CancellationTokenPair tokenPair)
   at Couchbase.KeyValue.CouchbaseCollection.UpsertAsync[T](String id, T content, UpsertOptions options)