Weird GET request on internet facing Nginx

I spun up an internet facing nginx server in AWS and the logs started showing weird get requests with a search engine’s spider as user agent. - - [19/Aug/2020:20:09:19 +0000] "GET /rexcategory?categoryCodes=SHPCAT33&t=1360657001168 HTTP/1.1" 404 153 "-" "Sogou web spider/4.0(+" ""  2020/08/19 20:08:39 [error] 29#29: *14 open() "/usr/share/nginx/html/eyloyrewards/category" failed (2: No such file or directory), client:, server: localhost, request: "GET /eyloyrewards/category?categoryCode=SHPCAT118&t=1314948609334 HTTP/1.1", host: "" - - [19/Aug/2020:20:08:39 +0000] "GET /eyloyrewards/category?categoryCode=SHPCAT118&t=1314948609334 HTTP/1.1" 404 153 "-" "Sogou web spider/4.0(+" "" 

The domain mentioned in the second line does not belong to me. What is the meaning of these logs? Is my server being used to attack the mentioned domain, "" ?