search: prevent username related conditions from removing "stop words" Before this revision, username related conditions below cause unintentional ignorance of "stop words". - owner: (for all) - author: (for "Commit messages") Therefore, username related conditions with "this", "a", "you", and so on are completely ignored, even if they are valid username components. To prevent username related conditions from removing "stop words", this revision explicitly specifies "analyzer" for username related fields of SCHEMA and CHGSETS_SCHEMA. Difference between EMAILADDRANALYZER and default analyzer of TEXT is whether "stop words" are preserved or not. Tokenization is still applied on usernames. For future changing, this revision doesn't make EMAILADDRANALYZER share analyzer definition with PATHANALYZER, even though their definitions are identical with each other at this revision. This revision requires full re-building index tables, because indexing schemas are changed. Original patch has been modified by Mads Kiilerich - tests of 'owner' will be addressed separately.

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