Sometime you need to debug your Sphinx indexes to know what’s inside it, is it okay, is there document you trying to find? In this case indextool utility might be very handy as it gathers information directly from index files even searchd is not started. Here few examples of indextool usage:
Checking index consistency
One of the most important functions of indextool is checking index consistency. You will need to have sphinx config file and index files.
/path/to/indextool -c sphinx.conf --check my_sphinx_index