@Ram Chaitanya
First of all you need to check what's the URL address. Check the page path on debug view mode. GA normally strips the query parameter. So if the URL is not available in GA, it would be hard to get indexed.
If that's the case, you need to create virtual pageview for each search pages.
However, I just cross check the below URL.
https://wiser.eco/products/product/Bamboo%20Solar
It seems to be a headless page. Google will not index it as it doesn't have any content. And also, it seems, no GA tag installed. Solving these issues will help you index
Yes, as
@Max Peters suggested, the noindex, nofollow tags.
@Diana It would be really difficult to maintain a sitemap around search queries, as these are dynamic in nature and got populated based on the search parameters.