Question: I am struggling to develop a general design that could better handle how to present 4k filters to users on a website, but not looking for e-commerce designs as the filters will also contain many filtering levels within.

The idea so far is to display all the filters in a left-side panel and the results would display to the right of it. But the left side pannel might end up being super long -- which is likely too overwhelming for users.

Any ideas?

Answer: 
There isn't an industry-wide agreed convention for what it is called, but I would call it a **Contextual search**.

On the [Carbon design system documentation](https://carbondesignsystem.com/components/search/usage/#formatting) by IBM, it's just called a Search.
[![enter image description here](https://i.stack.imgur.com/1PqYb.png)](https://i.stack.imgur.com/1PqYb.png)

I wouldn't call it a filter search, as this screenshot below from [Ant design system](https://ant.design/components/table#components-table-demo-filter-search) explains what a filter search is *(at least to them)*, and this behavior isn't what you described.
[![enter image description here](https://i.stack.imgur.com/svgKw.png)](https://i.stack.imgur.com/svgKw.png)
search within results

or

add additional filters