message: Update how to guide search on limiting where techdocs collator is searching the documents
diff: @@ -131,3 +131,26 @@ indexBuilder.addCollator({
  As shown above, you can add a catalog entity filter to narrow down what catalog
  entities are indexed by the search engine.
  +
  +## How to limit where TechDocs Collator scanning the Software Catalog
  +
  +The DefaultTechDocsCollator is responsible for indexing the TechDocs into search.
  +The way it does is by getting all the entities every refresh interval from the
  +catalog and find the entities that has annotation `backstage.io/techdocs-ref`,
  +the process of getting all the entities is quite expensive if you have a large
  +amount of entity catalog data. To relieve the process, you can filter where the
  +DefaultTechDocsCollator is scanning your entities.
  +
  +```typescript
  +indexBuilder.addCollator({
  + defaultRefreshIntervalSeconds: 600,
  + collator: DefaultTechDocsCollator.fromConfig(config, {
  + discovery,
  + logger,
  + tokenManager,
  ++ filter: {
  ++ kind: ['API', 'Component', 'Domain', 'System'],
  ++ },
  + }),
  +});
  +```
  