Update caseinsensitive with refresh blocked in Elastic 9

[knopa]

Elastic.Clients.Elasticsearch version:
9.0.4
Elasticsearch version:
9.0.1
.NET runtime version:
.net 9
Operating system version:
linux

Description of the problem including expected versus actual behavior:
A clear and concise description of what the bug is.
Elastic.Transport.TransportException: Request failed to execute. Call: Status code 400 from: POST /index/_update/id_cities?refresh=True. ServerError: Type: illegal_argument_exception Reason: "Unknown value for refresh: [True]."

Steps to reproduce:

await Client.UpdateAsync<MailboxMessageSearch, object>(
                 result.index,
                 Infer.Id(item),
                 d => d.Doc(new
                 {
                     item.LabelType,
                     item.Status,
                     item.Email,//for old messages
                     item.Outbound //for old messages
                 })
                     .Refresh(Refresh.True)

Expected behavior
?refresh=True should be in lowercase

[flobernd]

Duplicate of #8545

Workaround: Downgrade to the patch version before the latest one.

[knopa]

Ok thanks

[flobernd]

Fixed in 9.0.5.