solr 4.10.3 and index.xxxxxxxxxxx directory

[Dominique Bejean]

Hi,

Is it normal with Solr 4.10.3 that the data directory of replicas still
contains directories like

index.3636365667474747
index.9990809809888876

and files

index.properties
replica.properties

If yes, why and in which circumstances ?

Regards

Dominique