lucene indexer stopped without complete the whole files

I'm using Hibernate Search built on top of Lucene indexing to deal with text files existing in MySQL database. The hibernate search version 4.1.1, lucene version 3.5.0 and MySQL version 5.6 . All functions that I need was working well(search , indexing ... etc). Recently, I moved the same code, libraries, and database to another server with bigger hard disk and RAM.

The problem is the lucene indexer stopped without complete the whole files without any warning or errors. what could be the problem?