feat: Support Nested for joining queries.

query_joining.go

@@ -0,0 +1,40 @@
+package esquery
+
+// NestedQuery represents a query of type nested as described in:
+// https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-nested-query.html
+type NestedQuery struct {
+	path           string
+	query          Mappable
+	scoreMode      string
+	ignoreUnmapped bool
+}
+
+func Nested(path string, query Mappable) *NestedQuery {
+	return &NestedQuery{
+		path:  path,
+		query: query,
+	}
+}
+
+func (n *NestedQuery) ScoreMode(mode string) *NestedQuery {
+	n.scoreMode = mode
+	return n
+}
+
+func (n *NestedQuery) IgnoreUnmapped(val bool) *NestedQuery {
+	n.ignoreUnmapped = val
+	return n
+}
+
+// Map returns a map representation of the query, thus implementing the
+// Mappable interface.
+func (n *NestedQuery) Map() map[string]interface{} {
+	innerMap := map[string]interface{}{"path": n.path, "query": n.query.Map()}
+	if n.scoreMode != "" {
+		innerMap["score_mode"] = n.scoreMode
+	}
+	if n.ignoreUnmapped == true {
+		innerMap["ignore_unmapped"] = n.ignoreUnmapped
+	}
+	return map[string]interface{}{"nested": innerMap}
+}

query_joining_test.go

@@ -0,0 +1,22 @@
+package esquery
+
+import (
+	"testing"
+)
+
+func TestNested(t *testing.T) {
+	runMapTests(t, []mapTest{
+		{
+			"Nested Query",
+			Nested("dns_values", Term("dns_values.type", "A")).ScoreMode("max").IgnoreUnmapped(true),
+			map[string]interface{}{
+				"nested": map[string]interface{}{
+					"path":            "dns_values",
+					"query":           Term("dns_values.type", "A").Map(),
+					"score_mode":      "max",
+					"ignore_unmapped": true,
+				},
+			},
+		},
+	})
+}