When a shard becomes search active then trigger a refresh instead of waiting for the next scheduled refresh.
The `IndexShard#awaitShardSearchActive(...)` method registers a refresh listener and then often waits for the refresh scheduler to trigger a refresh. By default this is one second. In order to avoid increasing the query time of the Search API, the mentioned method should trigger a refresh instead for waiting it to happen.

As part of this change we also need to disable the refresh scheduler completely. Otherwise we run at risk of running two refreshes next after each other. One triggered from making shard search active and one from the refresh scheduler.  



server/src/main/java/org/elasticsearch/index/shard/IndexShard.java
allShardsUseRetentionLeases = false;
                        break;
                    }
                    if (this.shardRouting.relocating()) {
                        ShardRouting shardRoutingReloc = this.shardRouting.getTargetRelocatingShard();
                        if (shardRoutingReloc.assignedToNode() == false
                            || retentionLeases.contains(ReplicationTracker.getPeerRecoveryRetentionLeaseId(shardRoutingReloc)) == false) {
                            allShardsUseRetentionLeases = false;
                            break;
                        }
                    }
                }
            }
            useRetentionLeasesInPeerRecovery = allShardsUseRetentionLeases;
        }
    }
    /**
     * Marks the shard as recovering based on a recovery state, fails with exception is recovering is not allowed to be set.
     */
    public IndexShardState markAsRecovering(String reason, RecoveryState recoveryState) throws IndexShardStartedException,
        IndexShardRelocatedException, IndexShardRecoveringException, IndexShardClosedException {
        synchronized (mutex) {
            if (state == IndexShardState.CLOSED) {
                throw new IndexShardClosedException(shardId);
            }
            if (state == IndexShardState.STARTED) {
                throw new IndexShardStartedException(shardId);
            }
            if (state == IndexShardState.RECOVERING) {
                throw new IndexShardRecoveringException(shardId);