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
*/
    public Sort getIndexSort() {
        return indexSortSupplier.get();
    }
    public ShardGetService getService() {
        return this.getService;
    }
    public ShardBitsetFilterCache shardBitsetFilterCache() {
        return shardBitsetFilterCache;
    }
    public MapperService mapperService() {
        return mapperService;
    }
    public SearchOperationListener getSearchOperationListener() {
        return this.searchOperationListener;
    }
    public BulkOperationListener getBulkOperationListener() {
        return this.bulkOperationListener;
    }
    public ShardIndexWarmerService warmerService() {
        return this.shardWarmerService;
    }
    public ShardRequestCache requestCache() {
        return this.requestCacheStats;
    }
    public ShardFieldData fieldData() {
        return this.shardFieldData;
    }
    public boolean isSystem() {
        return indexSettings.getIndexMetadata().isSystem();