feat: remove slash on the elasticsearch url

[shyim]

Right now the URL is like http://127.0.0.1:49155/

This causes errors like:

BadRequest400Exception {"error":"no handler found for uri [/_search] and method [POST]"}

because on OpenSearch Client it will append a double slash to all urls.

So I have removed the trailing slash

[tucksaun]

This was added on purpose: see #155 and #154

[shyim]

I will adjust it in our application. But for me it's still a issue in symfony-cli and platform.sh is for me not "the standard way" to do it :)

[tucksaun]

Yeah, trailing or non-trailing slashes are always a bit difficult as you never know what you will end up with 😕
In libraries or foundation code where a developer or end-user can input something of their choice, I personally tend to always normalize trailing slashes the way I expect things to be just to be on the safe side