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## org.apache.lucene.index
Class IndexUpgrader

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

    public final class IndexUpgrader

extends Object

This is an easy-to-use tool that upgrades all segments of an index from previous Lucene versions to the current segment file format. It can be used from command line:

      java -cp lucene-core.jar org.apache.lucene.index.IndexUpgrader [-delete-prior-commits] [-verbose] indexDir

Alternatively this class can be instantiated and `upgrade()` invoked. It uses `UpgradeIndexMergePolicy` and triggers the upgrade via an forceMerge request to `IndexWriter`.

This tool keeps only the last commit in an index; for this reason, if the incoming index has more than one commit, the tool refuses to run by default. Specify `-delete-prior-commits` to override this, allowing the tool to delete all but the last commit. From Java code this can be enabled by passing `true` to `IndexUpgrader(Directory,Version,PrintStream,boolean)`.

Warning: This tool may reorder documents if the index was partially upgraded before execution (e.g., documents were added). If your application relies on "monotonicity" of doc IDs (which means that the order in which the documents were added to the index is preserved), do a full forceMerge instead. The `MergePolicy` set by `IndexWriterConfig` may also reorder documents.

Constructor Summary
`IndexUpgrader(Directory dir, IndexWriterConfig iwc, boolean deletePriorCommits)` Creates index upgrader on the given directory, using an `IndexWriter` using the given config.
`IndexUpgrader(Directory dir, Version matchVersion)` Creates index upgrader on the given directory, using an `IndexWriter` using the given `matchVersion`.
`IndexUpgrader(Directory dir, Version matchVersion, PrintStream infoStream, boolean deletePriorCommits)` Creates index upgrader on the given directory, using an `IndexWriter` using the given `matchVersion`.

Method Summary
`static void` | `main(String[] args)` Main method to run {code IndexUpgrader} from the command-line.
`void` | `upgrade()` Perform the upgrade.

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

Constructor Detail

### IndexUpgrader

    public IndexUpgrader(Directory dir,
                         Version matchVersion)

  Creates index upgrader on the given directory, using an `IndexWriter` using the given `matchVersion`. The tool refuses to upgrade indexes with multiple commit points.

### IndexUpgrader

    public IndexUpgrader(Directory dir,
                         Version matchVersion,
                         PrintStream infoStream,
                         boolean deletePriorCommits)

  Creates index upgrader on the given directory, using an `IndexWriter` using the given `matchVersion`. You have the possibility to upgrade indexes with multiple commit points by removing all older ones. If `infoStream` is not `null`, all logging output will be sent to this stream.

### IndexUpgrader

    public IndexUpgrader(Directory dir,
                         IndexWriterConfig iwc,
                         boolean deletePriorCommits)

  Creates index upgrader on the given directory, using an `IndexWriter` using the given config. You have the possibility to upgrade indexes with multiple commit points by removing all older ones.

Method Detail

### main

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

  Main method to run {code IndexUpgrader} from the command-line.

  Throws:
    `IOException`

### upgrade

    public void upgrade()
                 throws IOException

  Perform the upgrade.

  Throws:
    `IOException`

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