1) Librarian, at times 2) One whose work is at an end 3) Skilled worker 4) Someone who provides an index 5) Trained worker 
[programming] In object-oriented programming, an indexer allows instances of a particular class or struct to be indexed just like arrays. == Implementation == Indexers are implemented through the not get and set accessors for the {C_sharp|operator[]}. They are similar to properties, but differ by not being static, and the fact that indexers...
• (n.) One who makes an index.
electronics that convert high level computer or PLC commands to step and direction pulses.
In'dex·er noun One who makes an index. 
[n] - someone who provides an index
The Indexer is a person who analyzes the content of a book, pulling key words and themes out. This person then lists these terms in the back of the book and references the pages in which they may be found on.