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
}
        return new DelegatingAnalyzerWrapper(Analyzer.PER_FIELD_REUSE_STRATEGY) {
            @Override
            protected Analyzer getWrappedAnalyzer(String fieldName) {
                return mapperService.indexAnalyzer(
                    fieldName,
                    f -> { throw new IllegalArgumentException("Field [" + f + "] has no associated analyzer"); }
                );
            }
        };
    }
    private EngineConfig newEngineConfig(LongSupplier globalCheckpointSupplier) {
        final Sort indexSort = indexSortSupplier.get();
        final Engine.Warmer warmer = reader -> {
            assert Thread.holdsLock(mutex) == false : "warming engine under mutex";
            assert reader != null;
            if (this.warmer != null) {
                this.warmer.warm(reader);
            }
        };
        final boolean isTimeBasedIndex = mapperService == null ? false : mapperService.mappingLookup().hasTimestampField();
        return new EngineConfig(
            shardId,
            threadPool,
            indexSettings,
            warmer,
            store,
            indexSettings.getMergePolicy(isTimeBasedIndex),
            buildIndexAnalyzer(mapperService),
            similarityService.similarity(mapperService == null ? null : mapperService::fieldType),