code: public ThingTypeProperties withSearchableAttributes(String... searchableAttributes) {
          if (this.searchableAttributes == null) {
              setSearchableAttributes(new java.util.ArrayList<String>(searchableAttributes.length));
          }
          for (String ele : searchableAttributes) {
              this.searchableAttributes.add(ele);
          }
          return this;
      }
docs: <p>
  A list of searchable thing attribute names.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSearchableAttributes(java.util.Collection)} or {@link #withSearchableAttributes(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param searchableAttributes
  A list of searchable thing attribute names.
  @return Returns a reference to this object so that method calls can be chained together.