I think that you can handle this by creating a search index that is
composite of c.field1 and p.field2.
For example:
Child(Ancestor)
ParentChildJoin
field1 : "name1"
field2: "aa"
So, to query for a child object you only have to retrieve it using:
List<ParentChildJoin> joins = pm.createQuery(ParentChildJoin.class,"where
field1='"name1'" && field2='"aa").execute();
Child c = pm.getObjectById(Child.class,joings.get(0).getKey().getParent());
The following relation could be created using task queue after parent or
child was updated.
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