Unable to ingest field names with periods for ip type

Describe the bug
When attempting to ingest an ip type from a field name with a dot (client.ip), the field fails to ingest properly and the field does not exist when querying the data.

Additionally, there is differing behavior on query time when ingesting flattened vs unflattened json:

• Unflattened: client":{"ip":"1.1.1.1"} returns no results/queries for the IP
• Flattened: "client.ip":"1.1.1.1" still shows no client.ip field in the results but you can search for the ip and it does return the correct doc(s)

Steps to reproduce (if applicable)

1. Ingest sample ( {"@timestamp":"2024-08-20T16:54:22.842000000Z","client":{"ip":"1.1.1.1"}})
2. Query index and it returns:
   {
   "@timestamp": "2024-08-20T16:54:22.842000000Z"
   }

Expected behavior
I expected the ip to be ingested as an ip type.

Configuration:

Quickwit Version: 0.8.2

Index Config:

version: 0.8
index_id: test3
doc_mapping:
    mode: lenient
    timestamp_field: '@timestamp'
    field_mappings:
      - name: '@timestamp'
        type: datetime
        input_formats:
          - iso8601
        output_format: iso8601
        fast_precision: seconds
        fast: true
      - name: client.ip
        type: ip
        fast: true