[ML][Fleet] Update Transform installation mechanism to support upgrade paths

x-pack/plugins/fleet/server/saved_objects/index.ts

@@ -254,6 +254,7 @@ const getSavedObjectTypes = (
           properties: {
             id: { type: 'keyword' },
             type: { type: 'keyword' },
+            version: { type: 'keyword' },
           },
         },
         installed_kibana: {

x-pack/plugins/fleet/server/services/epm/elasticsearch/ingest_pipeline/remove.ts

@@ -46,11 +46,12 @@ export async function deletePipeline(esClient: ElasticsearchClient, id: string):
   // '*' shouldn't ever appear here, but it still would delete all ingest pipelines
   if (id && id !== '*') {
     try {
-      await esClient.ingest.deletePipeline({ id });
+      // @TODO: Remove ignore 400
+      await esClient.ingest.deletePipeline({ id }, { ignore: [400] });
     } catch (err) {
       // Only throw if error is not a 404 error. Sometimes the pipeline is already deleted, but we have
       // duplicate references to them, see https://github.com/elastic/kibana/issues/91192
-      if (err.statusCode !== 404) {
+      if (err.statusCode !== 404 || err.statusCode !== 400) {
         throw new FleetError(`error deleting pipeline ${id}: ${err}`);
       }
     }

x-pack/plugins/fleet/server/services/epm/elasticsearch/transform/common.ts

@@ -6,3 +6,8 @@
  */
 
 export { getAsset } from '../../archive';
+
+// Index alias that points to just one destination index from the latest package version
+export const TRANSFORM_DEST_IDX_ALIAS_LATEST_SFX = '.latest';
+// Index alias that points to all of the destination indices from all the package versions
+export const TRANSFORM_DEST_IDX_ALIAS_ALL_SFX = '.all';