6. The one or more computer-storage media devices of claim 1 , wherein the contextual signals further include a confidence score that indicates a confidence level as to how confident a contextual signal provider is with the corresponding user-specific feature.
6. The one or more computer-storage media devices of claim 1 , wherein the contextual signals further include a confidence score that indicates a confidence level as to how confident a contextual signal provider is with the corresponding user-specific feature. 7. The one or more computer-storage media devices of claim 6 , further comprising utilizing the confidence scores to re-rank the documents in the set of non-contextual search results.