How to mapping in nest constructure

Elastic Stack Elasticsearch
1

My data structure is

{
   eventData :{
      level:6,
     class:beginner
   }
}

or

{
   eventData :{
      level:6,
     money:1000
   }
}

Please tell me how to mapping on this structure.
eventData have various constructure so we cannot make mapping when we make index.

Thank you.

2

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