### Description

`SearchResponse.Clusters` currently uses a `HashMap<String, AtomicReference>` for storing Cluster objects. The AtomicReference CAS swaps are done in a do/while loop in most cases (e.g., in `CCSSingleCoordinatorSearchProgressListener`).

This can be replaced with a `ConcurrentHashMap` in conjunction with either `compute()` method or the `replace(key, assumed_previous_value, value)` method for atomically swapping in a new Cluster object with a CAS operation, assuring that the updates don't lose data from competing threads doing separate Cluster object updates.

See: https://github.com/elastic/elasticsearch/pull/98457/files#r1310467586 
server/src/main/java/org/elasticsearch/action/search/CCSSingleCoordinatorSearchProgressListener.java
break; 
                }
                if (curr.getStatus() == SearchResponse.Cluster.Status.FAILED || curr.getStatus() == SearchResponse.Cluster.Status.SKIPPED) {
                    break; 
                }
                SearchResponse.Cluster updated = new SearchResponse.Cluster.Builder(curr).setTimedOut(true).build();
                swapped = clusterRef.compareAndSet(curr, updated);
            } while (swapped == false);
        }
    }
    /**
     * Executed when a shard reports a query failure.
     *
     * @param shardIndex The index of the shard in the list provided by {@link SearchProgressListener#onListShards})}.
     * @param shardTarget The last shard target that thrown an exception.
     * @param e The cause of the failure.
     */
    @Override
    public void onQueryFailure(int shardIndex, SearchShardTarget shardTarget, Exception e) {
        if (clusters.hasClusterObjects() == false) {
            return;
        }
        String clusterAlias = shardTarget.getClusterAlias();
        if (clusterAlias == null) {
            clusterAlias = RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY;
        }
        AtomicReference<SearchResponse.Cluster> clusterRef = clusters.getCluster(clusterAlias);
        boolean swapped;
        do {
            TimeValue took = null;