## org.apache.lucene.index
Class IndexSorter

    java.lang.Object
      org.apache.lucene.index.IndexSorter

    public class IndexSorter

extends Object

Sort an index by document importance factor. Higher scoring documents are assigned smaller document numbers. Document weights are obtained from a specified field, which has to be single-valued and stored, with string value that represents a float number. Stored fields in the output index remain consistent, i.e. both stored fields and postings are renumbered in sync.

NOTE: this tool is unaware of documents added atomically via `IndexWriter.addDocuments(java.util.Collection<org.apache.lucene.document.Document>)` or `IndexWriter.updateDocuments(org.apache.lucene.index.Term, java.util.Collection<org.apache.lucene.document.Document>)`, which means it can easily break up such document groups.

Constructor Summary
`IndexSorter()`

Method Summary
`static void` `main(String[] args)`
`void` `sort(Directory input, Directory output, String field)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### IndexSorter

    public IndexSorter()

Method Detail

### sort

    public void sort(Directory input,
                     Directory output,
                     String field)
              throws IOException

  Throws:
    `IOException`

### main

    public static void main(String[] args)
                     throws Exception

  Throws:
    `Exception`