However, if you want a specific that defined how modern systems index files efficiently, here is the top recommendation:
It compares the classic Inverted Index vs. Signature Files vs. Bitmaps. If you are building a system to index files, this paper explains mathematically why Inverted Indices are the superior choice for file systems compared to other methods. index of files
The Lucene Search Engine: An Open Source Search Engine Author: Doug Cutting (2002/Various Hadoop/Lucene documentation) However, if you want a specific that defined