Store fields with the same name and type

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1

I want to search some data by tags.
Can i store 2 or more fields with the same name and type in document?
Can i use this mapping for that?
{
"properties": {
"tag": {
"type": "keyword"
},
"origin": {
"type": "keyword"
}
}
}
How can i add a new tag to the document and search by them?
Should i use an array of a tags?
What is the best way to do that?

2

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