I want to store data in an index global without defining an index in an inherited class.
Example:

Class Aclass [ Abstract ]
{
Index TXSBI On TextSearch(KEYS);
Index TXSSI On TextSimilarity(KEYS) [ Data = TextSimilarity(ELEMENTS) ];
Property TextSearch As %Text(LANGUAGECLASS = "%ZText.Czech", MAXLEN = 1000, XMLPROJECTION = "NONE");
Property TextSimilarity As %Text(LANGUAGECLASS = "%ZText.CzechSim", MAXLEN = 1000, SIMILARITYINDEX = "TXSSI", XMLPROJECTION = "NONE");
...
//other code

Class AAclass Extends (%Persistent, ClassType.SuperClass, Aclass,