How can i retrive value in milliseconds format on range filter?

Elastic Stack Elasticsearch
1

I have this example, where I'm trying to get a doc value inside a range filter.

Someone can help me?

...filter('range', **{
                   'debts.ocurrenceDate': {
                            'gte': "doc['eventDatetime'].value.getMillis()",
                            'lte': XXXXXX (any milliseconds)
                    }
                  })
2

What kind of code is that?

Anyway elasticsearch supports dates as ms since epoch.