@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    super.toData(out, context);
    out.writeBoolean(modifiable);
  }
Setter for property modifiable.

@param modifiable New value of property modifiable.
geode-core/src/main/java/org/apache/geode/cache/query/internal/StructBag.java