Elasticsearch filter date range not works with before 1970's records

Question

I am facing issue with date range, Here is my query

 "filter": {
        "script": {
          "script": "(min..max).contains(doc.admitted_date.date.year)",
          "params": {
            "min": 1965,
            "max": 2015
          }
        }
      }

When i pass this query it was not work, it was showing all the results, if i am passing "min" : 1971 it was working. This filter is not working with 1970. if i am passing "min":1958 and "max":1969 it was working. when i include 1970, the filter was not working. please help me out to fix this issue.

EDIT :

It will fetch the records from null value. If the admitted_date is null. it will shown in the 1970's records.

Thanks in advance,