See pull request for a fix:
https://github.com/ezsystems/ezfind/pull/15

Steps to reproduce

1. Create a class that has at least 1 object relation and 1 object relations attribute
2. Create an object (A) of that class, and fill the object relation and object relations attribute with the same object (B)
3. Search for object A. Get desired result.
4. Move object B to the trash.
5. Update title of object A to something like "A watermelon".
6. Search for "watermelon" and do not get the expected result, because re-indexing of object A failed.