searching for content based on labels:
- labelling content currently does not trigger reindexing of the content. need an efficient
approach to handle indexing of labels. do not want to reindex entire page just because we
have added/removed a label.
searching for content based on labels:
just schedule the content for reindexing when a label is added/removed. if the performance becomes an issue, we can implement a more intelligent approach to label indexing.