uncaughtException: ResponseError: illegal_argument_exception while yarn mage2vs import

[a-devops-guy]

receiving error uncaughtException: ResponseError: illegal_argument_exception date=Sat Oct 24 2020 17:47:54 GMT+0000 (Coordinated Universal Time), pid=6889, uid=1000, gid=1000, cwd=/home/kiran/vue-storefront-api, execPath=/usr/bin/node, version=v10.19.0, argv=[/usr/bin/node, /home/kiran/vue-storefront-api/node_modules/mage2vuestorefront/src/cli.js, blocks], rss=74104832, heapTotal=40951808, heapUsed=26168264, external=165268, loadavg=[1.49609375, 2.45751953125, 1.73974609375], uptime=3066, trace=[column=15, file=/home/kiran/vue-storefront-api/node_modules/mage2vuestorefront/src/adapters/nosql/elasticsearch.js, function=null, line=110, method=null, native=false, column=25, file=/home/kiran/vue-storefront-api/node_modules/once/once.js, function=f, line=25, method=null, native=false, column=11, file=/home/kiran/vue-storefront-api/node_modules/@elastic/elasticsearch/lib/Transport.js, function=IncomingMessage.response.on, line=289, method=on, native=false, column=15, file=events.js, function=IncomingMessage.emit, line=203, method=emit, native=false, column=12, file=_stream_readable.js, function=endReadableNT, line=1145, method=null, native=false, column=19, file=internal/process/next_tick.js, function=process._tickCallback, line=63, method=_tickCallback, native=false], stack=[Error: ResponseError: illegal_argument_exception, at /home/kiran/vue-storefront-api/node_modules/mage2vuestorefront/src/adapters/nosql/elasticsearch.js:110:15, at f (/home/kiran/vue-storefront-api/node_modules/once/once.js:25:25), at IncomingMessage.response.on (/home/kiran/vue-storefront-api/node_modules/@elastic/elasticsearch/lib/Transport.js:289:11), at IncomingMessage.emit (events.js:203:15), at endReadableNT (_stream_readable.js:1145:12), at process._tickCallback (internal/process/next_tick.js:63:19)]

while importing data from magento to es7 (7.3.1)