[SOLR-2338] improved per-field similarity integration into schema.xml

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0-ALPHA
• Fix Version/s: 4.0-ALPHA
• Component/s: Schema and Analysis
• Assignee: Robert Muir
• Reporter: Robert Muir
• Created: 27/Jan/11 23:16
• Updated: 10/May/13 10:39
• Resolved: 31/Mar/11 20:13

Description

Currently since LUCENE-2236, we can enable Similarity per-field, but in schema.xml there is only a 'global' factory
for the SimilarityProvider.

In my opinion this is too low-level because to customize Similarity on a per-field basis, you have to set your own
CustomSimilarityProvider with <similarity class=.../> and manage the per-field mapping yourself in java code.

Instead I think it would be better if you just specify the Similarity in the FieldType, like after <analyzer>.

As far as the example, one idea from LUCENE-1360 was to make a "short_text" or "metadata_text" used by the
various metadata fields in the example that has better norm quantization for its shortness...

Issue Links

• depends upon: LUCENE-2986 divorce defaultsimilarityprovider from defaultsimilarity
• relates to: SOLR-2600 ensure example schema.xml has some mention/explanation of per field similarity vs similarityprovider vs (global) similarity