Searching a large number of unavailable shards through e.g. the `*` pattern while a large cluster is recovering from a full restart or so, leads to extremely large responses containing an exception for each shard.


![](https://user-images.githubusercontent.com/6490959/193701098-868888bc-cdc7-4104-a32a-d9c84d74aef2.png)

This example shows a 375M on heap response for ~25k unavailable shards being returned. Over the wire, this serialises with a similar size and we'd have 700M+ peak heap usage for a search request when the valid search response in a green cluster might be much smaller than this.
It seems to me that we could mostly resolve this by not returning the stack trace in this specific case of the shard not available exception (it doesn't seem valuable for users and we made a similar fix around unavailable shards in snapshots state responses)? 
server/src/main/java/org/elasticsearch/action/search/AbstractSearchAsyncAction.java
private final Map<SearchShardIterator, Integer> shardIndexMap;
    private final int expectedTotalOps;
    private final AtomicInteger totalOps = new AtomicInteger();
    private final int maxConcurrentRequestsPerNode;
    private final Map<String, PendingExecutions> pendingExecutionsPerNode = new ConcurrentHashMap<>();
    private final boolean throttleConcurrentRequests;
    private final AtomicBoolean requestCancelled = new AtomicBoolean();
    private final List<Releasable> releasables = new ArrayList<>();
    AbstractSearchAsyncAction(
        String name,
        Logger logger,
        SearchTransportService searchTransportService,
        BiFunction<String, String, Transport.Connection> nodeIdToConnection,
        Map<String, AliasFilter> aliasFilter,
        Map<String, Float> concreteIndexBoosts,
        Executor executor,
        SearchRequest request,
        ActionListener<SearchResponse> listener,
        GroupShardsIterator<SearchShardIterator> shardsIts,
        SearchTimeProvider timeProvider,
        ClusterState clusterState,
        SearchTask task,
        SearchPhaseResults<Result> resultConsumer,
        int maxConcurrentRequestsPerNode,
        SearchResponse.Clusters clusters
    ) {
        super(name);
        final List<SearchShardIterator> toSkipIterators = new ArrayList<>();
        final List<SearchShardIterator> iterators = new ArrayList<>();
        for (final SearchShardIterator iterator : shardsIts) {