diff --git a/.changeset/curly-brooms-raise.md b/.changeset/curly-brooms-raise.md
new file mode 100644
index 0000000000..84c8892f7c
--- /dev/null
+++ b/.changeset/curly-brooms-raise.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-search-backend': patch
+---
+
+Deprecate create router as the legacy backend system will no longer be supported.
diff --git a/.changeset/ninety-mayflies-raise.md b/.changeset/ninety-mayflies-raise.md
new file mode 100644
index 0000000000..62042c2615
--- /dev/null
+++ b/.changeset/ninety-mayflies-raise.md
@@ -0,0 +1,6 @@
+---
+'@backstage/plugin-search-backend-module-elasticsearch': patch
+'@backstage/plugin-search-backend-module-pg': patch
+---
+
+Internal refactor to use `LoggerService` and `DatabaseService` instead of the legacy `Logger` and `PluginDatabaseManager` types.
diff --git a/.changeset/purple-glasses-tease.md b/.changeset/purple-glasses-tease.md
new file mode 100644
index 0000000000..5a107c1a2b
--- /dev/null
+++ b/.changeset/purple-glasses-tease.md
@@ -0,0 +1,11 @@
+---
+'@backstage/plugin-search-backend-module-techdocs': patch
+'@backstage/plugin-search-backend-module-catalog': patch
+'@backstage/plugin-search-backend-module-explore': patch
+---
+
+The following collator factories are deprecated, please [migrate](https://backstage.io/docs/backend-system/building-backends/migrating) to the new backend system and follow the instructions below to install collators via module:
+
+- `DefaultCatalogCollatorFactory`: https://github.com/backstage/backstage/blob/nbs10/search-deprecate-create-router/plugins/search-backend-module-catalog/README.md#installation;
+- `ToolDocumentCollatorFactory`: https://github.com/backstage/backstage/blob/nbs10/search-deprecate-create-router/plugins/search-backend-module-explore/README.md#installation;
+- `DefaultTechDocsCollatorFactory`: https://github.com/backstage/backstage/blob/nbs10/search-deprecate-create-router/plugins/search-backend-module-techdocs/README.md#installation.