Fully decouple IndexWriter from analyzers
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Key: LUCENE-2309
URL: https://issues.apache.org/jira/browse/LUCENE-2309
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Michael McCandless
IndexWriter only needs an AttributeSource to do indexing.
Yet, today, it interacts with Field instances, holds a private
analyzers, invokes analyzer.reusableTokenStream, has to deal with a
wide variety (it's not analyzed; it is analyzed but it's a Reader,
String; it's pre-analyzed).
I'd like to have IW only interact with attr sources that already
arrived with the fields. This would be a powerful decoupling -- it
means others are free to make their own attr sources.
They need not even use any of Lucene's analysis impls; eg they can
integrate to other things like [OpenPipeline|http://www.openpipeline.org].
Or make something completely custom.
LUCENE-2302 is already a big step towards this: it makes IW agnostic
about which attr is "the term", and only requires that it provide a
BytesRef (for flex).
Then I think LUCENE-2308 would get us most of the remaining way -- ie, if the
FieldType knows the analyzer to use, then we could simply create a
getAttrSource() method (say) on it and move all the logic IW has today
onto there. (We'd still need existing IW code for back-compat).
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