Why do I get "The request signature we calculated does not match the signature you provided." for GET but not PUT for OpenSearch?
Solution 1:
i also had this issue, using the same tutorial
reading the docs on request body searches, i found it states the following:
Note The _search API accepts HTTP GET and POST for request body searches, but not all HTTP clients support adding a request body to a GET request. POST is the more universal choice.
changing my method to POST solved the issue for me