added the drop and create index statements to the migration
added the drop and create index statements to the migration

yngcan/patentprocessor,yngcan/patentprocessor,funginstitute/patentprocessor,yngcan/patentprocessor,funginstitute/patentprocessor,nikken1/patentprocessor,nikken1/patentprocessor,funginstitute/patentprocessor,nikken1/patentprocessor