Bro::ElasticSearch - ElasticSearch log writer (dynamic, version 1.0)
    [Writer] ElasticSearch (Log::WRITER_ELASTICSEARCH)
    [Constant] LogElasticSearch::cluster_name
    [Constant] LogElasticSearch::server_host
    [Constant] LogElasticSearch::server_port
    [Constant] LogElasticSearch::index_prefix
    [Constant] LogElasticSearch::type_prefix
    [Constant] LogElasticSearch::transfer_timeout
    [Constant] LogElasticSearch::max_batch_size
    [Constant] LogElasticSearch::max_batch_interval
    [Constant] LogElasticSearch::max_byte_size

