Question: I have a String like this:

```
Test+${user}100,very important text

```

I am trying to remove the part `+${user}100`

Why my code isn't working?

```
noSpecialSigns = noSpecialSigns.replaceAll("\\+$\\{user}\\d","");

```

Answer: 
This sometime happens when you miss annotated entity class with annotation @Document

* Wrong
@Document(collation = "department")
* Right
@Document(collection = "department")
On my side i used `@Document(collection = "products")` and worked.
Use `collection` instead of `collation` in `@Document`.