private String dropIndexDDL(String indexName){
  sb.setLength(0);
  sb.append("drop index \"");
  sb.append(indexName);
  sb.append("\"");
  return (sb.toString());
}

private String dropIndexDDL ( String indexName ) { sb . setLength ( 0 ) ; sb . append ( "drop index \"" ) ; sb . append ( indexName ) ; sb . append ( "\"" ) ; return ( sb . toString ( ) ) ; }
build the drop ddl for an index
