[jira] [Created] (LUCENE-7321) Character Mapping

["Ivan Provalov (JIRA)" <ji...@apache.org>]

Ivan Provalov created LUCENE-7321:
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             Summary: Character Mapping
                 Key: LUCENE-7321
                 URL: https://issues.apache.org/jira/browse/LUCENE-7321
             Project: Lucene - Core
          Issue Type: New Feature
          Components: modules/analysis
    Affects Versions: 6.0.1, 5.4.1, 6.0, 4.6.1
            Reporter: Ivan Provalov
            Priority: Minor
             Fix For: 6.0.1


One of the challenges in search is recall of an item with a common typing variant.  These cases can be as simple as lower/upper case in most languages, accented characters, or more complex morphological phenomena like prefix omitting, or constructing a character with some combining mark.  This component addresses the cases, which are not covered by ASCII folding component, or more complex to design with other tools.  The idea is that a linguist could provide the mappings in a tab-delimited file, which then can be directly used by Solr.

The mappings are maintained in the tab-delimited file, which could be just a copy paste from Excel spreadsheet.  This gives the linguists the opportunity to create the mappings, then for the developer to include them in Solr configuration.  There are a few cases, when the mappings grow complex, where some additional debugging may be required.  The mappings can contain any sequence of characters to any other sequence of characters.

Some of the cases I discuss in detail document are handling the voiced vowels for Japanese; common typing substitutions for Korean, Russian, Polish; transliteration for Polish, Arabic; prefix removal	for Arabic; suffix folding for Japanese.



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