Hands-On Software Engineering with Golang

Creating a new Elasticsearch indexer instance

To create a new Elasticsearch search indexer, clients need to invoke the NewElasticSearchIndexer constructor and provide a list of elastic search nodes to connect to. Our implementation will use the official Go client for Elasticsearch, which is provided by the go-elastic package ^[21]:

func NewElasticSearchIndexer(esNodes []string) (*ElasticSearchIndexer, error) {
    cfg := elasticsearch.Config{
        Addresses: esNodes,
    }
    es, err := elasticsearch.NewClient(cfg)
    if err != nil {
        return nil, err
    }
    if err = ensureIndex(es); err != nil {
        return nil, err
    }

    return &ElasticSearchIndexer{
        es: es,
    }, nil
}

After creating a new go-elastic client, the constructor invokes the ensureIndex helper, which checks whether ...