How to change Index.mapping.depth.limit

Elastic Stack Elasticsearch
1

How would you set the index.mapping.depth.limit field? I have been getting this error:

"status" : 400,
"error" : {
"type" : "illegal_argument_exception",
"reason" : "Limit of mapping depth [20] in index [durations2] has been exceeded due to object field [metadata.pkg-value-esk. ( cd .............]"

2

What kind of data do you have that causes you to run into this? How do you query something with that level of nesting? What is the use case?