The search which comes with Sitefinity out of the box is indexing the content in all pages.
For customized search you have to implement a custom pipe. You can see how the TxtDocumentSearchInboundPipe in the sample project from Publishing system brief walkthrough
. This is creating a pipe that will push the items into the search index when they are published. The only requirement is to be published by the fluent api. You have to implement PushData and ToPublishingPoint. Those methods will actually put the item into the publishing point. Note that you have to add some settings / mappings as it was explained in Registering custom pipes in Sitefinity
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