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
private NonClosingReaderWrapper(DirectoryReader in) throws IOException {
            super(in, new SubReaderWrapper() {
                @Override
                public LeafReader wrap(LeafReader reader) {
                    return reader;
                }
            });
        }
        @Override
        protected DirectoryReader doWrapDirectoryReader(DirectoryReader in) throws IOException {
            return new NonClosingReaderWrapper(in);
        }
        @Override
        protected void doClose() {
            
        }
        @Override
        public CacheHelper getReaderCacheHelper() {
            return in.getReaderCacheHelper();
        }
    }
    public void close(String reason, boolean flushEngine) throws IOException {
        synchronized (engineMutex) {