Delete doesn't delete all indexes

I am trying to delete a month of logstash indexes, and fire off e.g. this
command:

curl -XDELETE "http://localhost:9200/logstash-2014.05*?pretty"

which returns within a few seconds (less than a minute - the default
timeout afaik) with:
{
"acknowledged" : true
}

But when I look at the indexes, only a couple have been deleted... I have
to repeat the command several times until all indexes from the month are
deleted.
Is this a bug, or am I doing something wrong?

Cheers,
-Robin-

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