Due to cross-cluster search using
: to separate a cluster and index name,
index names may no longer contain
Negative values were interpreted as zero in earlier versions but are no longer accepted.
In previous versions issuing a
had the undocumented side-effect of refreshing the index which made new documents
visible to searches and non-realtime GET operations. From now on these operations
don’t have this side-effect anymore. To make documents visible an explicit
call is needed unless the index is refreshed by the internal scheduler.