diff --git a/services/search/pkg/opensearch/internal/osu/osu.go b/services/search/pkg/opensearch/internal/osu/osu.go
index 820065f409..e959db90fc 100644
--- a/services/search/pkg/opensearch/internal/osu/osu.go
+++ b/services/search/pkg/opensearch/internal/osu/osu.go
@@ -12,7 +12,6 @@ import (
 
 type Builder interface {
 	json.Marshaler
-	fmt.Stringer
 	Map() (map[string]any, error)
 }
 
@@ -64,11 +63,10 @@ func applyBuilder(target map[string]any, key string, builder Builder) error {
 		return fmt.Errorf("failed to map builder %s: %w", key, err)
 	}
 
-	if isEmpty(data) {
-		return nil
+	if !isEmpty(data) {
+		target[key] = data
 	}
 
-	target[key] = data
 	return nil
 }
 
diff --git a/services/search/pkg/opensearch/internal/osu/query_bool.go b/services/search/pkg/opensearch/internal/osu/query_bool.go
index 30a06d176f..3627f839ca 100644
--- a/services/search/pkg/opensearch/internal/osu/query_bool.go
+++ b/services/search/pkg/opensearch/internal/osu/query_bool.go
@@ -85,8 +85,3 @@ func (q *BoolQuery) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *BoolQuery) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/query_full_text_match_phrase.go b/services/search/pkg/opensearch/internal/osu/query_full_text_match_phrase.go
index 2def251a8c..e1823d3b9a 100644
--- a/services/search/pkg/opensearch/internal/osu/query_full_text_match_phrase.go
+++ b/services/search/pkg/opensearch/internal/osu/query_full_text_match_phrase.go
@@ -56,8 +56,3 @@ func (q *MatchPhraseQuery) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *MatchPhraseQuery) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/query_term_level_ids.go b/services/search/pkg/opensearch/internal/osu/query_term_level_ids.go
index 409f3f94cf..c7eb734b52 100644
--- a/services/search/pkg/opensearch/internal/osu/query_term_level_ids.go
+++ b/services/search/pkg/opensearch/internal/osu/query_term_level_ids.go
@@ -47,8 +47,3 @@ func (q *IDsQuery) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *IDsQuery) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/query_term_level_ids_test.go b/services/search/pkg/opensearch/internal/osu/query_term_level_ids_test.go
index bc693ebb49..8693a921e2 100644
--- a/services/search/pkg/opensearch/internal/osu/query_term_level_ids_test.go
+++ b/services/search/pkg/opensearch/internal/osu/query_term_level_ids_test.go
@@ -16,6 +16,15 @@ func TestIDsQuery(t *testing.T) {
 			Got:  osu.NewIDsQuery(),
 			Want: nil,
 		},
+		{
+			Name: "no options",
+			Got:  osu.NewIDsQuery("1", "2", "3", "3"),
+			Want: map[string]any{
+				"ids": map[string]any{
+					"values": []string{"1", "2", "3"},
+				},
+			},
+		},
 		{
 			Name: "ids",
 			Got:  osu.NewIDsQuery("1", "2", "3", "3").Options(&osu.IDsQueryOptions{Boost: 1.0}),
diff --git a/services/search/pkg/opensearch/internal/osu/query_term_level_range.go b/services/search/pkg/opensearch/internal/osu/query_term_level_range.go
index 083e3e0cfc..d471a8ad42 100644
--- a/services/search/pkg/opensearch/internal/osu/query_term_level_range.go
+++ b/services/search/pkg/opensearch/internal/osu/query_term_level_range.go
@@ -90,8 +90,3 @@ func (q *RangeQuery[T]) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *RangeQuery[T]) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/query_term_level_term.go b/services/search/pkg/opensearch/internal/osu/query_term_level_term.go
index 39eaf3be6c..9fb588609e 100644
--- a/services/search/pkg/opensearch/internal/osu/query_term_level_term.go
+++ b/services/search/pkg/opensearch/internal/osu/query_term_level_term.go
@@ -56,8 +56,3 @@ func (q *TermQuery[T]) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *TermQuery[T]) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/query_term_level_wildcard.go b/services/search/pkg/opensearch/internal/osu/query_term_level_wildcard.go
index f21255c64f..398909a225 100644
--- a/services/search/pkg/opensearch/internal/osu/query_term_level_wildcard.go
+++ b/services/search/pkg/opensearch/internal/osu/query_term_level_wildcard.go
@@ -56,8 +56,3 @@ func (q *WildcardQuery) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(data)
 }
-
-func (q *WildcardQuery) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
diff --git a/services/search/pkg/opensearch/internal/osu/request.go b/services/search/pkg/opensearch/internal/osu/request.go
index fc33c65eaf..60125d0dd8 100644
--- a/services/search/pkg/opensearch/internal/osu/request.go
+++ b/services/search/pkg/opensearch/internal/osu/request.go
@@ -3,12 +3,8 @@ package osu
 import (
 	"bytes"
 	"encoding/json"
-	"io"
-	"strings"
 
 	opensearchgoAPI "github.com/opensearch-project/opensearch-go/v4/opensearchapi"
-
-	"github.com/opencloud-eu/opencloud/pkg/conversions"
 )
 
 type RequestBody[O any] struct {
@@ -21,20 +17,16 @@ func NewRequestBody[O any](q Builder, o ...O) *RequestBody[O] {
 }
 
 func (q RequestBody[O]) Map() (map[string]any, error) {
-	data, err := conversions.To[map[string]any](q.options)
+	base, err := newBase(q.options)
 	if err != nil {
 		return nil, err
 	}
 
-	if err := applyBuilder(data, "query", q.query); err != nil {
+	if err := applyBuilder(base, "query", q.query); err != nil {
 		return nil, err
 	}
 
-	if isEmpty(data) {
-		return nil, nil
-	}
-
-	return data, nil
+	return base, nil
 }
 
 func (q RequestBody[O]) MarshalJSON() ([]byte, error) {
@@ -46,15 +38,6 @@ func (q RequestBody[O]) MarshalJSON() ([]byte, error) {
 	return json.Marshal(data)
 }
 
-func (q RequestBody[O]) String() string {
-	b, _ := q.MarshalJSON()
-	return string(b)
-}
-
-func (q RequestBody[O]) Reader() io.Reader {
-	return strings.NewReader(q.String())
-}
-
 //----------------------------------------------------------------------------//
 
 type HighlightOption struct {
@@ -72,12 +55,11 @@ type ScriptOption struct {
 //----------------------------------------------------------------------------//
 
 func BuildSearchReq(req *opensearchgoAPI.SearchReq, q Builder, o ...SearchReqOptions) (*opensearchgoAPI.SearchReq, error) {
-	body := NewRequestBody(q, o...)
-	data, err := body.MarshalJSON()
+	body, err := json.Marshal(NewRequestBody(q, o...))
 	if err != nil {
 		return nil, err
 	}
-	req.Body = bytes.NewReader(data)
+	req.Body = bytes.NewReader(body)
 	return req, nil
 }
 
@@ -88,24 +70,22 @@ type SearchReqOptions struct {
 //----------------------------------------------------------------------------//
 
 func BuildDocumentDeleteByQueryReq(req opensearchgoAPI.DocumentDeleteByQueryReq, q Builder) (opensearchgoAPI.DocumentDeleteByQueryReq, error) {
-	body := NewRequestBody[any](q)
-	data, err := body.MarshalJSON()
+	body, err := json.Marshal(NewRequestBody[any](q))
 	if err != nil {
 		return req, err
 	}
-	req.Body = bytes.NewReader(data)
+	req.Body = bytes.NewReader(body)
 	return req, nil
 }
 
 //----------------------------------------------------------------------------//
 
 func BuildUpdateByQueryReq(req opensearchgoAPI.UpdateByQueryReq, q Builder, o ...UpdateByQueryReqOptions) (opensearchgoAPI.UpdateByQueryReq, error) {
-	body := NewRequestBody(q, o...)
-	data, err := body.MarshalJSON()
+	body, err := json.Marshal(NewRequestBody(q, o...))
 	if err != nil {
 		return req, err
 	}
-	req.Body = bytes.NewReader(data)
+	req.Body = bytes.NewReader(body)
 	return req, nil
 }
 
@@ -116,11 +96,10 @@ type UpdateByQueryReqOptions struct {
 //----------------------------------------------------------------------------//
 
 func BuildIndicesCountReq(req *opensearchgoAPI.IndicesCountReq, q Builder) (*opensearchgoAPI.IndicesCountReq, error) {
-	body := NewRequestBody[any](q)
-	data, err := body.MarshalJSON()
+	body, err := json.Marshal(NewRequestBody[any](q))
 	if err != nil {
 		return nil, err
 	}
-	req.Body = bytes.NewReader(data)
+	req.Body = bytes.NewReader(body)
 	return req, nil
 }