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/test/java/org/elasticsearch/index/shard/IndexShardTests.java
AtomicInteger preIndex = new AtomicInteger();
        AtomicInteger postIndexCreate = new AtomicInteger();
        AtomicInteger postIndexUpdate = new AtomicInteger();
        AtomicInteger postIndexException = new AtomicInteger();
        AtomicInteger preDelete = new AtomicInteger();
        AtomicInteger postDelete = new AtomicInteger();
        AtomicInteger postDeleteException = new AtomicInteger();
        shard.close("simon says", true);
        shard = reinitShard(shard, new IndexingOperationListener() {
            @Override
            public Engine.Index preIndex(ShardId shardId, Engine.Index operation) {
                preIndex.incrementAndGet();
                return operation;
            }
            @Override
            public void postIndex(ShardId shardId, Engine.Index index, Engine.IndexResult result) {
                switch (result.getResultType()) {
                    case SUCCESS:
                        if (result.isCreated()) {
                            postIndexCreate.incrementAndGet();
                        } else {
                            postIndexUpdate.incrementAndGet();
                        }
                        break;
                    case FAILURE:
                        postIndex(shardId, index, result.getFailure());
                        break;
                    default:
                        fail("unexpected result type:" + result.getResultType());
                }