presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/client/SearchShardsResponse.java/SearchShardsResponse/SearchShardsResponse
class SearchShardsResponse:    @JsonCreator
    public SearchShardsResponse(@JsonProperty("shards") List<List<Shard>> shardGroups)
    {
        requireNonNull(shardGroups, "shardGroups is null");

        this.shardGroups = ImmutableList.copyOf(shardGroups);
    }