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
synchronized (postRecoveryMutex) {
                readAllowed = isReadAllowed();
            }
        }
        if (readAllowed) {
            refreshListeners.addOrNotify(checkpoint, allowUnIssuedSequenceNumber, listener);
        } else {
            
            listener.onFailure(new IllegalIndexShardStateException(shardId, state, "Read not allowed on IndexShard"));
        }
    }
    private static class RefreshMetricUpdater implements ReferenceManager.RefreshListener {
        private final MeanMetric refreshMetric;
        private long currentRefreshStartTime;
        private Thread callingThread = null;
        private RefreshMetricUpdater(MeanMetric refreshMetric) {
            this.refreshMetric = refreshMetric;
        }
        @Override
        public void beforeRefresh() {
            if (Assertions.ENABLED) {
                assert callingThread == null
                    : "beforeRefresh was called by " + callingThread.getName() + " without a corresponding call to afterRefresh";
                callingThread = Thread.currentThread();
            }
            currentRefreshStartTime = System.nanoTime();
        }
        @Override