Sphinx Data Structures & Lucene

Question

Search engines

Good afternoon.
Will anyone share their secret knowledge? :)
We need data structures of index files of search engines Sphinx, Lucene. If there is similar information on others, I won’t refuse either, if the engine is fast enough. The task set for myself is to understand the mechanism of filling search databases and searching through them. I would like to avoid tedious and ungrateful code-digging.
The general file structure of Lucene is described, but very general, I would like to go into more detail.

Answer 1

Look at Riak Search , it's somewhat compatible with Solr, and the data can be viewed as a key-value pair.

Answer 2

Sphinx is open-source, so any nuances that interest you can be viewed directly in the sources:
code.google.com/p/sphinxsearch/source/browse
Internal index format seems to be just what you need:
code.google. com/p/sphinxsearch/source/browse/trunk/doc/internals-index-format.txt