Range fields are off by one when default values are used

[lkts]

Elasticsearch Version

8.14

Installed Plugins

No response

Java Version

bundled

OS Version

Problem Description

Discovered in #107081 when adding tests.

When one or both ends of range have default values, they are not correctly stored to correspond to user input in case of open ranges.

Steps to Reproduce

PUT idx
{
  "mappings": {
    "properties": {
      "my_range": { "type": "long_range" }
    }
  }
}

Given:

PUT idx/_doc/1
{
  "my_range": {
    "gt": null,
    "lt": 300
  }
}

This query returns a hit even though the range was specified to exclude the start:

POST idx/_search
"query" : {
  "term" : {
      "my_range" : {
      "value": -9223372036854775808
    }
  }
}

While this correctly returns 0 hits:

POST idx/_search
{
  "query" : {
    "term" : {
        "my_range" : {
            "value": 300
        }
    }
  }
}

Logs (if relevant)

No response

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)