private void ensureRequiredIsMutable() {
      if (!required_.isModifiable()) {
        required_ = new com.google.protobuf.LazyStringArrayList(required_);
      }
      bitField0_ |= 0x00001000;
    }
<pre>
Optional. The order of the properties.
Not a standard field in open api spec. Only used to support the order of
the properties.
</pre>

<code>repeated string property_ordering = 25 [(.google.api.field_behavior) = OPTIONAL];
</code>

@param value The bytes of the propertyOrdering to add.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Schema.java