High CPU charge only for search engines bots


Hello,

Since the past few days I get several queries per second just for the Amazonbot search engine, so if I add to this search engine bots, the queries for the other search engines, it puts a huge load on the server. My CPU is on average between 3 and 10% only for search engines bots (mysqld).

Here is an example of queries:
SEMrush

100.26.177.229 – – (08/Oct/2020:21:09:28 +0000) “GET /peinture-numerique HTTP/1.1” 200 17604 “-” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5 (Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot)”
185.191.171.12 – – (08/Oct/2020:21:09:28 +0000) “GET /shop/un/p/0 HTTP/1.1” 200 14700 “-” “Mozilla/5.0 (compatible; SemrushBot/6~bl; + semrush)”
100.26.177.229 – – (08/Oct/2020:21:09:29 +0000) “GET /Finish/framed/ HTTP/1.1” 200 17529 “-” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5 (Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot)”
185.191.171.11 – – (08/Oct/2020:21:09:30 +0000) “GET /shop/nature/p/50 HTTP/1.1” 200 13972 “-” “Mozilla/5.0 (compatible; SemrushBot/6~bl; + semrush)”
100.26.177.229 – – (08/Oct/2020:21:09:30 +0000) “GET /Finish/print/ HTTP/1.1” 200 17473 “-” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5 (Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot)”

But also what is this amazonbot for? We have nothing referenced for sale on Amazon.

Is it useful to let the bots load my server this way or should I set a limit via the robots.txt file?

Cheers,
Vincent.