I am sure core search doesn't do this (sadly) but technically seems pretty simple so maybe a module.
let's say i have a node called Artist which is a collection of a few nodereference fields which link to another node type called Contact
so let's say i have an Artist "Alan Parsons" which has a field called agent which is a noderef to a Contact called Joe Smith, and the joe smith contact node has a field called Address with the data "123 Sunnybrook"
so, when i search on Artists for the data "sunnybrook" i'd like it to find Alan Parsons.
seems obvious.. can't believe i haven't come across this requirement before.
Anyone know of a module that fills search index table with related content? (as i think thats what would be required)