Directed data indexing based on conceptual relevance

A non-transitory machine-readable storage medium stores instructions that upon execution cause a processor to, in response to initiation of a data indexing for a search concept, retrieve content of a first data source via a data connector, the retrieved content including a reference to a second data source. The instructions further cause the processor to, in response to a determination that the retrieved content of the first data source is relevant to the search concept: index the retrieved content of the first data source; retrieve content of the second data source based on the reference; and determine whether the retrieved content of the second data source is relevant to the search concept.