Count number of objects nested field

Elastic Stack Elasticsearch
1

How to count number of objects in a nested filed in elastic search?

Sample mapping :

"keywords": {
"type": "nested",
"properties": {
"base": {
"type": "text"
},
"category": {
"type": "text"
} }
}
I would like to count number of objects in nested filed 'keywords'.

2

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