Why my elasticsearch index has a lot deleted doc?

Elastic Stack Elasticsearch
1

env:

elasticsearch 6.2.4

My application just has insert operations，but my elasticsearch index has a lot deleted doc when I check elasticsearch status?

{
"primaries": {
"docs": {
"count": 1044318,
"deleted": 34382
},
"store": {
"size_in_bytes": 61327772606
},
"indexing": {
"index_total": 1487932,
"index_time_in_millis": 16874641,
"index_current": 0,
"index_failed": 0,
"delete_total": 0,
"delete_time_in_millis": 0,
"delete_current": 0,
"noop_update_total": 0,
"is_throttled": false,
"throttle_time_in_millis": 0
},
2

Are you updating existing documents?

3

Hi ，thank you for reply!

According to the developers said just has insert operations,may be inserting same data to ES

4

Inserting same data with the same _id means updating. Is it the case?
If it is, then that explains.

A document update is basically a Delete + Insert operation.

5

Thank you for reply!
Yes,it is the case!