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
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.LongSupplier;
import java.util.function.LongUnaryOperator;
import java.util.function.Supplier;
import static org.elasticsearch.cluster.metadata.DataStream.TIMESERIES_LEAF_READERS_SORTER;
import static org.elasticsearch.core.Strings.format;
import static org.elasticsearch.index.seqno.RetentionLeaseActions.RETAIN_ALL;
import static org.elasticsearch.index.seqno.SequenceNumbers.UNASSIGNED_SEQ_NO;
public class IndexShard extends AbstractIndexShardComponent implements IndicesClusterStateService.Shard {
    private final ThreadPool threadPool;
    private final MapperService mapperService;
    private final IndexCache indexCache;
    private final Store store;
    private final InternalIndexingStats internalIndexingStats;
    private final ShardSearchStats searchStats = new ShardSearchStats();
    private final ShardFieldUsageTracker fieldUsageTracker;
    private final String shardUuid = UUIDs.randomBase64UUID();
    private final long shardCreationTime;
    private final ShardGetService getService;
    private final ShardIndexWarmerService shardWarmerService;
    private final ShardRequestCache requestCacheStats;
    private final ShardFieldData shardFieldData;
    private final ShardBitsetFilterCache shardBitsetFilterCache;
    private final Object mutex = new Object();
    private final String checkIndexOnStartup;
    private final CodecService codecService;
    private final Engine.Warmer warmer;