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## Package org.apache.lucene.index.pruning

Static Index Pruning Tools

See:
Description

Class Summary
CarmelTopKTermPruningPolicy | Pruning policy with a search quality parameterized guarantee - configuration of this policy allows to specify two parameters: k and ε such that:
CarmelTopKTermPruningPolicy.ByDocComparator |
CarmelUniformTermPruningPolicy | Enhanced implementation of Carmel Uniform Pruning,
CarmelUniformTermPruningPolicy.ByDocComparator |
PruningPolicy | General Definitions for Index Pruning, such as operations to be performed on field data.
PruningTool | A command-line tool to configure and run a `PruningReader` on an input index and produce a pruned output index using `IndexWriter.addIndexes(IndexReader...)`.
RIDFTermPruningPolicy | Implementation of `TermPruningPolicy` that uses "residual IDF" metric to determine the postings of terms to keep/remove, as defined in http://www.dc.fi.udc.es/~barreiro/publications/blanco_barreiro_ecir2007.pdf.
StorePruningPolicy | Pruning policy for removing stored fields from documents.
TermPruningPolicy | Policy for producing smaller index out of an input index, by examining its terms and removing from the index some or all of their data as follows: all terms of a certain field - see `TermPruningPolicy.pruneAllFieldPostings(String)` all data of a certain term - see `TermPruningPolicy.pruneTermEnum(TermEnum)` all positions of a certain term in a certain document - see #pruneAllPositions(TermPositions, Term) some positions of a certain term in a certain document - see #pruneSomePositions(int, int[], Term)
TFTermPruningPolicy | Policy for producing smaller index out of an input index, by removing postings data for those terms where their in-document frequency is below a specified threshold.

## Package org.apache.lucene.index.pruning Description

Static Index Pruning Tools

This package provides a framework for pruning an existing index into a smaller index while retaining visible search quality as much as possible.

An index can be pruned in several levels:

1. Remove stored data: see StorePruningPolicy
2. Remove terms data: see TermPruningPolicy

Pruning can be applied programmatically via a PruningReader or with the static tool PruningTool.

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