Fix: when the update is null, the exception thrown in FindAndUpdateOperation should not mention that decoder is null

Signed-off-by: Gaspard Petit <[email protected]>

Author: Gaspard Petit

driver-core/src/main/com/mongodb/internal/operation/FindAndUpdateOperation.java

@@ -109,7 +109,7 @@ public FindAndUpdateOperation(final MongoNamespace namespace, final WriteConcern
     public FindAndUpdateOperation(final MongoNamespace namespace, final WriteConcern writeConcern, final boolean retryWrites,
                                   final Decoder<T> decoder, final BsonDocument update) {
         super(namespace, writeConcern, retryWrites, decoder);
-        this.update = notNull("decoder", update);
+        this.update = notNull("update", update);
         this.updatePipeline = null;
     }