Why elasticsearch results are not consistant?

Elastic Stack Elasticsearch
1

I have some documents in elasticsearch.

first I do

{
   "sort":[
      "@timestamp"
   ],
   "query":{
      "in":{
         "action_type":[
            "start",
            "end"
         ]
      }
   },
   "size":0
}

I get

{
   "took":58,
   "timed_out":false,
   "_shards":{
      "total":5,
      "successful":5,
      "failed":0
   },
   "hits":{
      "total":24435,
      "max_score":0.0,
      "hits":[

      ]
   }
}

Then I want to get latest 100 document, I do

{
   "sort":[
      "@timestamp"
   ],
   "query":{
      "in":{
         "action_type":[
            "start",
            "end"
         ]
      }
   },
   "from":24335,
   "size":100
}

it returns

{
   "took":25,
   "timed_out":false,
   "_shards":{
      "total":5,
      "successful":5,
      "failed":0
   },
   "hits":{
      "total":18327,
      "max_score":null,
      "hits":[

      ]
   }
}

Basically, the 2nd query indicates the total has been changed.

If I do the first query again, then still get the 1st result.

Why two queries are not returning same result?

by the way, if I use filter, it is the same

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