FairRescoreBuilder: Queue construction for fair Rescore should be reviewed

[tsuehr]

int max = Math.min(topDocs.scoreDocs.length, rescoreContext.getWindowSize());
at line 277 in FairRescoreBuilder.java will fail at the following example:
Docs in index =25
WindowSize = 10
k=10
Top 9 docs are nonprotected
We will only have one protected element there
for p= 0.8 and alpha = 0,1 we will need 6 protected elements

[tsuehr]

However, this can be seen as intended for very large indices.

Idea: for Index-size<400 execute a full index search for protected documents.