Presearcher (Lucene 9.0.0 monitor API)

java.lang.Object
- org.apache.lucene.monitor.Presearcher

Direct Known Subclasses:

TermFilteredPresearcher
```
public abstract class Presearcher
extends Object
```
A Presearcher is used by the Monitor to reduce the number of queries actually run against a Document. It defines how queries are stored in the monitor's internal index, and how a Document is converted to a query against that index.

Field Summary

Fields
Modifier and Type Field Description

static Presearcher NO_FILTERING
A Presearcher implementation that does no query filtering, and runs all registered queries

Constructor Summary

Constructors
Constructor Description

Presearcher()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract Query`	`buildQuery(LeafReader reader, BiPredicate<String,BytesRef> termAcceptor)`	Build a query for a Monitor's queryindex from a LeafReader over a set of documents to monitor.
`abstract Document`	`indexQuery(Query query, Map<String,String> metadata)`	Build a lucene Document to index the query in a Monitor's queryindex

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

- Field Detail
  - NO_FILTERING
```
public static final Presearcher NO_FILTERING
```
    A Presearcher implementation that does no query filtering, and runs all registered queries
- Constructor Detail
  - Presearcher
```
public Presearcher()
```
- Method Detail
  - buildQuery
```
public abstract Query buildQuery(LeafReader reader,
                                 BiPredicate<String,BytesRef> termAcceptor)
```
    Build a query for a Monitor's queryindex from a LeafReader over a set of documents to monitor.
    
    Parameters:
    
    reader - a LeafReader over the input documents
    
    termAcceptor - a predicate indicating if a term should be added to the query
    
    Returns:
    
    a Query to run over a Monitor's queryindex
  - indexQuery
```
public abstract Document indexQuery(Query query,
                                    Map<String,String> metadata)
```
    Build a lucene Document to index the query in a Monitor's queryindex
    
    Parameters:
    
    query - the Query to index
    
    metadata - a Map of arbitrary query metadata
    
    Returns:
    
    a lucene Document to add to the queryindex