public static boolean isAllIndices(List<String> aliasesOrIndices){
  return aliasesOrIndices == null || aliasesOrIndices.isEmpty() || isExplicitAllPattern(aliasesOrIndices);
}

public static boolean isAllIndices ( List < String > aliasesOrIndices ) { return aliasesOrIndices == null || aliasesOrIndices . isEmpty ( ) || isExplicitAllPattern ( aliasesOrIndices ) ; }
identifies whether the array containing index names given as argument refers to all indices the empty or null array identifies all indices
