I have dowloaded the data from the provided blog only https://www.elastic.co/blog/aftershock-therapy-with-elasticsearch-and-csv-data-import
The data is like this...
time,loc,latitude,longitude,depth,mag,id,place
2018-11-30T17:09:29.330Z,"61.3844,-149.4924",61.3844,-149.4924,0.1,0,chugiak,"0km N of Chugiak, Alaska"
2018-11-30T17:29:29.330Z,"61.3464,-149.9552",61.3464,-149.9552,46.7,7,ak20419010,"12km N of Anchorage, Alaska"
2018-11-30T17:32:27.605Z,"61.3978,-149.998",61.3978,-149.998,47,4.5,ak20463262,"13km S of Big Lake, Alaska"
2018-11-30T17:32:36.962Z,"61.4786,-149.9231",61.4786,-149.9231,37.2,4.6,ak20463263,"5km SSE of Big Lake, Alaska"
2018-11-30T17:33:52.950Z,"61.336,-149.9101",61.336,-149.9101,39.3,4.3,ak20463264,"16km N of Anchorage, Alaska"
2018-11-30T17:35:37.222Z,"61.2822,-149.9571",61.2822,-149.9571,40.8,5.7,ak20419042,"4km NNW of Anchorage, Alaska"
2018-11-30T17:36:37.807Z,"61.2833,-149.9082",61.2833,-149.9082,45.8,4.9,ak20463266,"7km N of Anchorage, Alaska"
2018-11-30T17:37:45.231Z,"61.4315,-150.0063",61.4315,-150.0063,41.1,4,ak20463267,"10km SSW of Big Lake, Alaska"
2018-11-30T17:39:37.593Z,"61.454,-150.0896",61.454,-150.0896,33.9,3.6,ak20463268,"13km SSW of Big Lake, Alaska"
2018-11-30T17:40:22.732Z,"61.5596,-149.5871",61.5596,-149.5871,28.7,3.1,ak20463269,"5km N of Knik-Fairview, Alaska"