Search query escape character doesn't work

## Expected Behavior

As per [this documentation article](https://go2docs.graylog.org/5-0/making_sense_of_your_log_data/writing_search_queries.html#Escaping), when doing a search query that has a special character - it has to be escaped by a backslash. So if I'm searching for e.g. _deso-mgmt01_ I have to write it like this: _deso\\-mgmt01_.

## Current Behavior

With that said, searching for this particular string by either _deso-mgmt01_ or _deso\\-mgmt01_ I get all, and identical, results that contain the deso part. without any regard for what comes after, escaped or not:

I do get more precise results if I try to search by putting the string in double quotes like _"deso-mgmt01"_ :

but doing it this way is even more inconsistent, in part, probably because it searches for the exact string. But then again I have two tables where I have that same string in a separate field, and putting it in double quotes shows the values only in one of the two tables, which makes no sense whatsoever.

## Possible Solution

## Steps to Reproduce (for bugs)

1. Search for some value that has a special character in the name, such as a dash (-)
2. Try to escape it with a backslash (\)
3. Try to put the string in double quotes
4. Observe the behavior

## Context

**What are you trying to accomplish?**
I'm trying to use the search as advertised.
## Your Environment

* Graylog Version: Graylog 4.3.9+e2c6648
* Java Version:
* Elasticsearch Version:
* MongoDB Version:
* Operating System: Ubuntu 11.0.17 on Linux 5.15.0-53-generic
* Browser version: latest MSE