I am looking for a way to neatly filter the values ​​from the event and create a map based on them.
What we need to know:

Event:
The event contains the dictionary data structure (its a map of <String, String> where key is a product parameter name.

For example:
a)

Key: Brand, 
Value: Nike

b)

Key: Producer,
Value: Audi

2. Filter:

Filter is a map <String, Set> and its configured in yml.

Example of values:

Key: Manufacturer,
Value: [Brand, Producer, Creator, Author]

3. Entity:

data class Product(
    val id: String,
    val parameters: Map<String, Parameter> = emptyMap()
) 
data class Parameter(
        val parameterId: String?,
        val parameterValue: String)

How flow looks like:

1)An event comes with a list of parameters, e.g.

mapOf(
"brand" to "Nike",
"size" to "42",
"color" to "black
)

2. Values ​​are filtered. Lets pretend we have got only one filter – its key = Manufacturer, its values = [Brand, Producer, Creator, Author].
   So from this event we have got only one position – its mapOf(“brand” to “Nike”)
   During filtering, a map is created in the domain object [Product] with filled field- parameters: Map <String, Parameter>
   e.g.

mapOf("Manufacturer" to Parameter(null, "Nike"))

As you can see – Manufacturer, not Brand, was selected as the key in the map in the Product object (i.e. the key of this parameter, not the value).

GOAL:

What should the method of filtering the event look like?How to do it in clever, Kotlin way (filter the data using the Map <String, Set > for the incoming map and create the target object based on it.)

Thanks in advance for help/advice!