Can we index and store fields that is present only in the mapping?

Elastic Stack Elasticsearch
1

I have a mapping which contains fields id, name and I index the document with fields id,name and age. Is it possible to limit only id and name and not age

2

You can configure dynamic field mapping to either ignore new fields (so they are not searchable) or even to reject a document that contains fields, which are not in the mapping. See

https://www.elastic.co/guide/en/elasticsearch/reference/5.5/dynamic-field-mapping.html