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Elasticsearch - Painless script to compare the current date with a date already indexed into a document

Elasticsearch Painless script which aims to calculate the difference in days between a date indexed into a document and the current date.

GET days_compare/_search
  "script_fields": {
    "diffdate": {
      "script": {
        "lang":   "painless",
        "source": """
        Instant Currentdate = Instant.ofEpochMilli(new Date().getTime());
        Instant Startdate = Instant.ofEpochMilli(doc['date'].value.getMillis());
        ChronoUnit.DAYS.between(Startdate, Currentdate);

# The result will be shown in days
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