Rescorer (elasticsearch-extend 3.2 API)

All Known Implementing Classes:

QueryRescorer
```
public interface Rescorer
```
A query rescorer interface used to re-rank the Top-K results of a previously executed search. Subclasses should borrow heavily from QueryRescorer because it is fairly well behaved and documents that tradeoffs that it is making. There is also an ExampleRescorer that is worth looking at.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Explanation`	`explain(int topLevelDocId, IndexSearcher searcher, RescoreContext rescoreContext, Explanation sourceExplanation)`	Executes an `Explanation` phase on the rescorer.
`TopDocs`	`rescore(TopDocs topDocs, IndexSearcher searcher, RescoreContext rescoreContext)`	Modifies the result of the previously executed search (`TopDocs`) in place based on the given `RescoreContext`.

- Method Detail
  - rescore
```
TopDocs rescore(TopDocs topDocs,
                IndexSearcher searcher,
                RescoreContext rescoreContext)
         throws IOException
```
    Modifies the result of the previously executed search (TopDocs) in place based on the given RescoreContext.
    
    Parameters:
    
    topDocs - the result of the previously executed search
    
    searcher - the searcher used for this search. This will never be null.
    
    rescoreContext - the RescoreContext. This will never be null
    
    Throws:
    
    IOException - if an IOException occurs during rescoring
  - explain
```
Explanation explain(int topLevelDocId,
                    IndexSearcher searcher,
                    RescoreContext rescoreContext,
                    Explanation sourceExplanation)
             throws IOException
```
    Executes an Explanation phase on the rescorer.
    
    Parameters:
    
    topLevelDocId - the global / top-level document ID to explain
    
    searcher - the searcher used for this search. This will never be null.
    
    rescoreContext - context for this rescorer
    
    sourceExplanation - explanation of the source of the documents being fed into this rescore
    
    Returns:
    
    the explain for the given top level document ID.
    
    Throws:
    
    IOException - if an IOException occurs