code: public static <TItem> Bson pull(final String fieldName, @Nullable final TItem value) {
          return new SimpleUpdate<TItem>(fieldName, value, "$pull");
      }
docs: Creates an update that removes all instances of the given value from the array value of the field with the given name.
  
  @param fieldName the non-null field name
  @param value     the value, which may be null
  @param <TItem>   the value type
  @return the update
  @mongodb.driver.manual reference/operator/update/pull/ $pull