Aggregations - getting all buckets with term aggregations

How can I use aggregations to get all of the buckets in my index?
Right now I add "size:30" to get all of the buckets.

GET /index_name/_search?size=0
      "terms":{"field":"Field_Name.keyword",**"size": 30**, 
        "order": {
          "_count": "desc"

But I will not know how many buckets there will be, so I'd like to send a command to get all buckets by default.

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