code: public QueryParser removeLanguage( String language ) {
          CheckArg.isNotNull(language, "language");
          return this.parsers.remove(language.toLowerCase());
      }
docs: Remove from this engine the language with the given name.
  
  @param language the name of the language, which is to match the {@link QueryParser#getLanguage() language} of the parser
  @return the parser for the language, or null if the engine had no support for the named language
  @throws IllegalArgumentException if the language is null