Michael McCandless created LUCENE-4695:
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Summary: Add utility class for getting live values for a given
field during NRT indexing
Key: LUCENE-4695
URL: https://issues.apache.org/jira/browse/LUCENE-4695
Project: Lucene - Core
Issue Type: Bug
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 4.2, 5.0
This is a simple utility/wrapper class, that holds the field
values for recently indexed documents until the NRT reader has
refreshed, and exposes a "get" API to get the last indexed value per
id.
For example one could use this to look up the "version" field for a
given id, even when that id was just indexed and not yet visible in
the NRT reader.
The implementation is fairly simple: it just watches the gen coming
out of NRTManager and updates/prunes accordingly.
The class is abstract: you must subclass it and impl the lookupFromSearcher
method...
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