Date format with timezone offset

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Assuming this is on some late 7.x version, according to the java the docs that we link from our format docs, five is the magic number in this case:

Offset Z : This formats the offset based on the number of pattern letters. One, two or three letters outputs the hour and minute, without a colon, such as '+0130'. The output will be '+0000' when the offset is zero. Four letters outputs the full form of localized offset, equivalent to four letters of Offset-O. The output will be the corresponding localized offset text if the offset is zero. Five letters outputs the hour, minute, with optional second if non-zero, with colon. It outputs 'Z' if the offset is zero. Six or more letters throws IllegalArgumentException .

This at least works for me on 7.6.2

DELETE test

PUT /_template/test
{
 	"index_patterns": ["test"],
	"mappings": {
 	  "properties": {
 			"date": { "type": "date", "format": "yyyy-MM-dd HH:mm:ssZZZZZ" }
 		}
 	}
 }
 
PUT /test/_doc/1
{  "date1": "2020-05-07 13:16:44+00:00" }

GET /test/_search
{
  "docvalue_fields": ["date"]
})

Formatting is also often weird to me, I keep re-reading those docs and need to try things every time, and zone offsets are especially hard. Hope this helps.