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To solve this problem I created a new Lucene index where all possible distincted values of each field are indexed seperatly.

So it's an index with a few thousand docs that have a single Term.
I want to extract all the values for a certain term. For example, I would like all values that have the fieldName "companyName".
Defining a WildcardQuery is off course not a solution. Neither is enumerating ALL fields and only saving the ones with the correct fieldName.

A: 

This should work (I take it it still is in C#)

IndexReader.Open(/* path to index */).Terms(new Term("companyName", String.Empty));
Razzie
ah, empty string :)(added C# tag)
borisCallens