fix(search): reindex on a fresh Meilisearch

Deleting a missing <uid>_next index is accepted with 202 and fails inside the
task with index_not_found. That error was not treated as not-found, so the first
reindex aborted and search stayed unavailable until indexes existed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

services/api/internal/search/meili.go

@@ -77,6 +77,7 @@ func (m *Meili) wait(ctx context.Context, t taskRef) error {
 			Status string `json:"status"`
 			Error  *struct {
 				Message string `json:"message"`
+				Code    string `json:"code"`
 			} `json:"error"`
 		}
 		if err := m.do(ctx, http.MethodGet, fmt.Sprintf("/tasks/%d", t.TaskUID), nil, &task); err != nil {
@@ -88,6 +89,10 @@ func (m *Meili) wait(ctx context.Context, t taskRef) error {
 		case "failed", "canceled":
 			msg := task.Status
 			if task.Error != nil {
+				// Удаление отсутствующего индекса принимается (202) и падает уже в задаче.
+				if task.Error.Code == "index_not_found" {
+					return fmt.Errorf("%w: task %d: %s", ErrMeiliNotFound, t.TaskUID, task.Error.Message)
+				}
 				msg = task.Error.Message
 			}
 			return fmt.Errorf("meilisearch: task %d: %s", t.TaskUID, msg)

services/api/internal/search/meili_test.go

@@ -0,0 +1,28 @@
+package search
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+// На чистом Meilisearch удаление несуществующего индекса падает в задаче, а не ответом 404.
+func TestCallMapsFailedIndexTaskToNotFound(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		if r.Method == http.MethodDelete {
+			w.WriteHeader(http.StatusAccepted)
+			_, _ = w.Write([]byte(`{"taskUid":0}`))
+			return
+		}
+		_, _ = w.Write([]byte(`{"status":"failed","error":{"code":"index_not_found","message":"Index ` + "`x`" + ` not found."}}`))
+	}))
+	defer srv.Close()
+
+	err := NewMeili(srv.URL, "").call(context.Background(), http.MethodDelete, "/indexes/x", nil)
+	if !errors.Is(err, ErrMeiliNotFound) {
+		t.Fatalf("err = %v, want ErrMeiliNotFound", err)
+	}
+}