Looking at incrementing version after delete

delete_version_increments.txt

# add a test doc
$ curl -X PUT server1:9200/test1/_doc/1 -H 'Content-Type: application/json' -d '{}'
{"_index":"test1","_type":"_doc","_id":"1","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":0,"_primary_term":1}

#delete the test doc, get a 200
$ curl -I -X DELETE server1:9200/test1/_doc/1
HTTP/1.1 200 OK
content-type: application/json; charset=UTF-8
content-length: 153


# delete a few more times, _version is incremented
$ curl -X DELETE server1:9200/test1/_doc/1
{"_index":"test1","_type":"_doc","_id":"1","_version":3,"result":"not_found","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":2,"_primary_term":1}

curl -X DELETE server1:9200/test1/_doc/1
{"_index":"test1","_type":"_doc","_id":"1","_version":4,"result":"not_found","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":3,"_primary_term":1}

etc...

# delete again but this time look at the status code, not the response
$ curl -I -X DELETE server1:9200/test1/_doc/1
HTTP/1.1 404 Not Found
content-type: application/json; charset=UTF-8
content-length: 155

# so it has gone...

# now, expunge
curl -X POST server1:9200/_forcemerge?only_expunge_deletes=false\&max_num_segments=100\&flush=true
{"_shards":{"total":61,"successful":31,"failed":0}}

# try the delete again, now version is 1 
$ curl -X DELETE server1:9200/test/_doc/1
{"_index":"test","_type":"_doc","_id":"1","_version":1,"result":"not_found","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":43,"_primary_term":2}