Hello Amr Elsayed,
We know of an issue related to the indexation in build Sitefinity 4.2 - please consult this article
and make sure you apply the fix and re-run the indexing of the website.
Also the content of your website needs to be reindexed in order for the search control to find the updated data. Still we do not have an implementation that will automatically reindex the whole website but your pages are getting automatically reindexed after publishing.
All the best,
the Telerik team
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