wiki.techinc.nl/maintenance/archives/patch-log_search-rename-index.sql

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SQL

-- Rename the primary unique index from PRIMARY to ls_field_val
-- This is for MySQL only and is necessary only for databases which were updated
-- between MW 1.16 development revisions r50567 and r51465.
ALTER TABLE /*_*/log_search
DROP PRIMARY KEY,
ADD UNIQUE INDEX ls_field_val (ls_field,ls_value,ls_log_id);