Special characters escaping for full-text search

// HotRodClientEntity c with following field is stored in a remote cache
clientId = "aa*bb";
// performed query with double backslash escaping
FROM kc.HotRodClientEntity c WHERE ((c.realmId = :realmId0) AND (c.clientId : '*a\\*b*'))
// result *nothing* is matched by the query

// performed query with single backslash escaping
FROM kc.HotRodClientEntity c WHERE ((c.realmId = :realmId0) AND (c.clientId : '*a\*b*'))
// exception is thrown
line 1:117 no viable alternative at character '*'
line 1:117 no viable alternative at input '*'
line 1:122 mismatched character '<EOF>' expecting '''
org.infinispan.client.hotrod.exceptions.HotRodClientException:Request for messageId=39 returned server error (status=0x85): org.infinispan.objectfilter.ParsingException: ISPN028526: Invalid query: FROM kc.HotRodClientEntity c WHERE ((c.realmId = :realmId0) AND (c.clientId : '*a\*b*')); Parser error messages: [[statement, selectStatement, querySpec, whereClause, logicalExpression, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, relationalExpression, additiveExpression, atom, expressionOrVector, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, relationalExpression, additiveExpression, atom, expressionOrVector, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, fullTextExpression, ftBoostedQuery, ftTermOrQuery]: line 1:117 state 0 (decision=72) no viable alt; token=[@41,117:117='*',<10>,1:117], [statement, selectStatement, querySpec, whereClause, logicalExpression, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, relationalExpression, additiveExpression, atom, expressionOrVector, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, relationalExpression, additiveExpression, atom]: line 1:122 mismatched token: [@43,122:122='<EOF>',<-1>,1:122]; expecting type RPAREN, [statement, selectStatement, querySpec, whereClause, logicalExpression, expression, logicalOrExpression, logicalAndExpression, negatedExpression, equalityExpression, relationalExpression, additiveExpression, atom]: line 1:122 mismatched token: [@43,122:122='<EOF>',<-1>,1:122]; expecting type RPAREN].
    at org.infinispan.client.hotrod.impl.protocol.Codec20.checkForErrorsInResponseStatus(Codec20.java:333)

// no escaping
FROM kc.HotRodClientEntity c WHERE ((c.realmId = :realmId0) AND (c.clientId : '*a*b*'))
// each entity that contains a and b in clientId is matched