Symfony Zend Lucene connect two tables

I have 2 connected Tables whit foreign key. I want to indexing fields from this two tables into zend lucene for search.

//example:
table 1 users:
username:
email:
...other fields
table 2 Users info:
users_id //Id from first table
first_name
last_name
city


I alredy have lucene on first table but i want to search whit all this fields.
How to merge first and second table ?

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