`org.elasticsearch.action.search.AbstractSearchAsyncAction#clusterState` is almost entirely unused, except for one trace log message and one call to `org.elasticsearch.cluster.ClusterState#getMinTransportVersion`. If the cluster state is changing quickly while searches are starting then these captured cluster states can consume substantial memory. If all we care about is the min transport version then we should just pass that in.

Note that the cluster state that ends up here is also captured by various lambdas (e.g. the one that runs after the can-match phase). The more we can reduce the scope of this cluster state capture, the better.
server/src/test/java/org/elasticsearch/action/search/SearchQueryThenFetchAsyncActionTests.java
Version.CURRENT.minimumCompatibilityVersion(),
            VersionUtils.getPreviousVersion(newVersion)
        );
        Version minVersion = oldVersion;
        final TransportSearchAction.SearchTimeProvider timeProvider = new TransportSearchAction.SearchTimeProvider(
            0,
            System.nanoTime(),
            System::nanoTime
        );
        AtomicInteger successfulOps = new AtomicInteger();
        Map<String, Transport.Connection> lookup = new ConcurrentHashMap<>();
        DiscoveryNode newVersionNode = DiscoveryNodeUtils.builder("node1").version(newVersion).build();
        DiscoveryNode oldVersionNode = DiscoveryNodeUtils.builder("node2").version(oldVersion).build();
        lookup.put("node1", new SearchAsyncActionTests.MockConnection(newVersionNode));
        lookup.put("node2", new SearchAsyncActionTests.MockConnection(oldVersionNode));
        OriginalIndices idx = new OriginalIndices(new String[] { "idx" }, SearchRequest.DEFAULT_INDICES_OPTIONS);
        ArrayList<SearchShardIterator> list = new ArrayList<>();
        ShardRouting routingNewVersionShard = ShardRouting.newUnassigned(
            new ShardId(new Index("idx", "_na_"), 0),
            true,
            RecoverySource.EmptyStoreRecoverySource.INSTANCE,
            new UnassignedInfo(UnassignedInfo.Reason.INDEX_CREATED, "foobar"),
            ShardRouting.Role.DEFAULT
        );
        routingNewVersionShard = routingNewVersionShard.initialize(newVersionNode.getId(), "p0", 0);
        routingNewVersionShard.started();
        list.add(new SearchShardIterator(null, new ShardId(new Index("idx", "_na_"), 0), singletonList(routingNewVersionShard), idx));
        ShardRouting routingOldVersionShard = ShardRouting.newUnassigned(
            new ShardId(new Index("idx", "_na_"), 1),
            true,