How do i set minimum query length in Examine?

Questions
1

How do i set min query length in examine? I have tried setting it in appsettings like this:

"Examine": {
    "LuceneDirectoryFactory": "SyncedTempFileSystemDirectoryFactory",
    "IndexSets": {
      "ExternalIndex": {
        "MinQueryStringLength": 2
      }
    }
  }

Im using Umbraco version 11.2.0

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/111379-how-do-i-set-minimum-query-length-in-examine