db['bsc-ls'].updateMany(
    {'$and':
        [
            {'covid_keywords': {'$exists': 0}},
            {'$text': {'$search': 'coronavirus corona virus coronaoutbreak COVID-19 COVID19 2019-nCoV 2019nCoV SARS-CoV-2 SARSCoV2 CoV-19 CoV19 COVD 19 COVD19 COVIDー19'}}
        ]
    },
    {
        'covid_keywords': 1
    }
)