Allow passing a custom item action (#231)

When manipulating profiles data, we need to be able to use the Update action rather than Create all the time.
So this change allows passing custom actions rather than hardcoding create.

If no actions is provided, the default value will be create.

bulk_indexer.go

@@ -49,6 +49,15 @@ import (
 // of concurrent bulk requests. This way we can ensure bulk requests have the
 // maximum possible size, based on configuration and throughput.
 
+const (
+	// Actions are all the actions that can be used when indexing data.
+	// `create` will be used by default.
+	ActionCreate = "create"
+	ActionDelete = "delete"
+	ActionIndex  = "index"
+	ActionUpdate = "update"
+)
+
 // BulkIndexerConfig holds configuration for BulkIndexer.
 type BulkIndexerConfig struct {
 	// Client holds the Elasticsearch client.
@@ -280,13 +289,25 @@ type BulkIndexerItem struct {
 	Index            string
 	DocumentID       string
 	Pipeline         string
+	Action           string
 	Body             io.WriterTo
 	DynamicTemplates map[string]string
 }
 
 // Add encodes an item in the buffer.
 func (b *BulkIndexer) Add(item BulkIndexerItem) error {
-	b.writeMeta(item.Index, item.DocumentID, item.Pipeline, item.DynamicTemplates)
+	action := item.Action
+	if action == "" {
+		action = ActionCreate
+	}
+
+	switch action {
+	case ActionCreate, ActionDelete, ActionIndex, ActionUpdate:
+	default:
+		return fmt.Errorf("%s is not a valid action", action)
+	}
+
+	b.writeMeta(item.Index, item.DocumentID, item.Pipeline, action, item.DynamicTemplates)
 	if _, err := item.Body.WriteTo(b.writer); err != nil {
 		return fmt.Errorf("failed to write bulk indexer item: %w", err)
 	}
@@ -297,8 +318,11 @@ func (b *BulkIndexer) Add(item BulkIndexerItem) error {
 	return nil
 }
 
-func (b *BulkIndexer) writeMeta(index, documentID, pipeline string, dynamicTemplates map[string]string) {
-	b.jsonw.RawString(`{"create":{`)
+func (b *BulkIndexer) writeMeta(index, documentID, pipeline, action string, dynamicTemplates map[string]string) {
+	b.jsonw.RawString(`{"`)
+	b.jsonw.RawString(action)
+	b.jsonw.RawString(`":{`)
+
 	first := true
 	if documentID != "" {
 		b.jsonw.RawString(`"_id":`)

bulk_indexer_test.go

@@ -29,6 +29,7 @@ import (
 
 	"github.com/elastic/go-docappender/v2"
 	"github.com/elastic/go-docappender/v2/docappendertest"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -203,3 +204,65 @@ func TestPipeline(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, int64(2), stat.Indexed)
 }
+
+func TestAction(t *testing.T) {
+	client := docappendertest.NewMockElasticsearchClient(t, func(w http.ResponseWriter, r *http.Request) {
+		_, result := docappendertest.DecodeBulkRequest(r)
+		err := json.NewEncoder(w).Encode(result)
+		require.NoError(t, err)
+
+		actions := []string{}
+		for _, itemsMap := range result.Items {
+			for a := range itemsMap {
+				actions = append(actions, a)
+			}
+		}
+
+		require.Equal(t, []string{"create", "update", "delete"}, actions)
+	})
+	indexer, err := docappender.NewBulkIndexer(docappender.BulkIndexerConfig{
+		Client: client,
+	})
+	require.NoError(t, err)
+
+	err = indexer.Add(docappender.BulkIndexerItem{
+		Index: "testidx",
+		Body: newJSONReader(map[string]any{
+			"@timestamp": time.Now().Format(docappendertest.TimestampFormat),
+		}),
+	})
+	require.NoError(t, err)
+
+	err = indexer.Add(docappender.BulkIndexerItem{
+		Index:  "testidx",
+		Action: "update",
+		Body: newJSONReader(map[string]any{
+			"@timestamp": time.Now().Format(docappendertest.TimestampFormat),
+		}),
+	})
+	require.NoError(t, err)
+
+	err = indexer.Add(docappender.BulkIndexerItem{
+		Index:    "testidx",
+		Action:   "delete",
+		Pipeline: "test-pipeline2",
+		Body: newJSONReader(map[string]any{
+			"@timestamp": time.Now().Format(docappendertest.TimestampFormat),
+		}),
+	})
+	require.NoError(t, err)
+
+	err = indexer.Add(docappender.BulkIndexerItem{
+		Index:    "testidx",
+		Action:   "foobar",
+		Pipeline: "test-pipeline2",
+		Body: newJSONReader(map[string]any{
+			"@timestamp": time.Now().Format(docappendertest.TimestampFormat),
+		}),
+	})
+	assert.Error(t, err)
+
+	stat, err := indexer.Flush(context.Background())
+	require.NoError(t, err)
+	require.Equal(t, int64(3), stat.Indexed)
+}