Reduce retention lease sync intervals (#40302)

This commit adjusts the frequency with which CCR renews retention leases
and with which primaries sync retention leases to replicas. This helps
Lucene reclaim soft-deleted documents more aggressively, which we have
found in some use-cases can help improve performance, and either way
will help keep disk space under more control.

server/src/main/java/org/elasticsearch/index/IndexService.java

@@ -940,7 +940,7 @@ public class IndexService extends AbstractIndexComponent implements IndicesClust
     public static final Setting<TimeValue> RETENTION_LEASE_SYNC_INTERVAL_SETTING =
             Setting.timeSetting(
                     "index.soft_deletes.retention_lease.sync_interval",
-                    new TimeValue(5, TimeUnit.MINUTES),
+                    new TimeValue(30, TimeUnit.SECONDS),
                     new TimeValue(0, TimeUnit.MILLISECONDS),
                     Property.Dynamic,
                     Property.IndexScope);

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/CcrRetentionLeases.java

@@ -27,7 +27,7 @@ public class CcrRetentionLeases {
     public static final Setting<TimeValue> RETENTION_LEASE_RENEW_INTERVAL_SETTING =
             Setting.timeSetting(
                     "index.ccr.retention_lease.renew_interval",
-                    new TimeValue(5, TimeUnit.MINUTES),
+                    new TimeValue(30, TimeUnit.SECONDS),
                     new TimeValue(0, TimeUnit.MILLISECONDS),
                     Setting.Property.NodeScope);