code: @SuppressWarnings("unchecked")
      public final FluentModelImplT withoutTag(String key) {
          if (this.inner().getTags() != null) {
              this.inner().getTags().remove(key);
          }
          return (FluentModelImplT) this;
      }
docs: Removes a tag from the resource.
  @param key the key of the tag to remove
  @return the next stage of the definition/update