code: public void setFacetNames(java.util.Collection<String> facetNames) {
          if (facetNames == null) {
              this.facetNames = null;
              return;
          }
  
          this.facetNames = new java.util.ArrayList<String>(facetNames);
      }
docs: <p>
  The names of facets that exist within the schema.
  </p>
  
  @param facetNames
  The names of facets that exist within the schema.