code: public ListFacetNamesResult withFacetNames(String... facetNames) {
          if (this.facetNames == null) {
              setFacetNames(new java.util.ArrayList<String>(facetNames.length));
          }
          for (String ele : facetNames) {
              this.facetNames.add(ele);
          }
          return this;
      }
docs: <p>
  The names of facets that exist within the schema.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFacetNames(java.util.Collection)} or {@link #withFacetNames(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param facetNames
  The names of facets that exist within the schema.
  @return Returns a reference to this object so that method calls can be chained together.