fix(index): index enum fields (#13428)

https://github.com/medusajs/medusa/issues/13372

What:
 - It handles enum fields corretly when added to filterable fields

integration-tests/modules/__tests__/index/query-index.spec.ts

@@ -514,6 +514,49 @@ medusaIntegrationTestRunner({
         expect(resultset.data.length).toEqual(1)
         expect(resultset.data[0].origin_country).toEqual("USA")
       })
+
+      it("should use query.index to filter enum field", async () => {
+        const products = await populateData(api)
+
+        const brandModule = appContainer.resolve("brand")
+        const link = appContainer.resolve(ContainerRegistrationKeys.LINK)
+        const brand = await brandModule.createBrands({
+          name: "Medusa Brand",
+        })
+
+        await link.create({
+          [Modules.PRODUCT]: {
+            product_id: products.find((p) => p.title === "Extra product").id,
+          },
+          brand: {
+            brand_id: brand.id,
+          },
+        })
+
+        const query = appContainer.resolve(
+          ContainerRegistrationKeys.QUERY
+        ) as RemoteQueryFunction
+
+        const resultset = await fetchAndRetry(
+          async () =>
+            await query.index({
+              entity: "product",
+              fields: ["id"],
+              filters: {
+                status: "published",
+                brand: {
+                  status: "active",
+                },
+              },
+            }),
+          ({ data }) => data.length > 0,
+          {
+            retries: 3,
+            waitSeconds: 3,
+          }
+        )
+        expect(resultset.data.length).toEqual(1)
+      })
     })
   },
 })