implement get_metadata in couch file, not in parse
implement get_metadata in couch file, not in parse

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