15. One or more computer-readable storage devices or memory devices comprising device-readable instructions which, upon execution perform operations comprising: processing a plurality of bug reports; identifying a plurality of phrases that are repeated in a bug report from the plurality of bug reports; selecting a first phrase from the plurality of phrases to keep and a second phrase from the plurality of phrases to drop based on a meaning of the first phrase being greater in significance in the bug report than a meaning of the second phrase; mapping the first phrase to one or more of a plurality of classes of an ontology model associated with the bug report, the ontology model defining valid interactions between the plurality of classes; determining whether the first phrase corresponds to a valid interaction defined by the ontology model; and based on determining the first phrase corresponds to a valid interaction defined by the ontology model, generating an output corresponding to the first phrase.
15. One or more computer-readable storage devices or memory devices comprising device-readable instructions which, upon execution perform operations comprising: processing a plurality of bug reports; identifying a plurality of phrases that are repeated in a bug report from the plurality of bug reports; selecting a first phrase from the plurality of phrases to keep and a second phrase from the plurality of phrases to drop based on a meaning of the first phrase being greater in significance in the bug report than a meaning of the second phrase; mapping the first phrase to one or more of a plurality of classes of an ontology model associated with the bug report, the ontology model defining valid interactions between the plurality of classes; determining whether the first phrase corresponds to a valid interaction defined by the ontology model; and based on determining the first phrase corresponds to a valid interaction defined by the ontology model, generating an output corresponding to the first phrase. 17. The one or more computer-readable storage devices or memory devices of claim 15 , wherein the device-readable instructions further perform operations comprising: querying a knowledge base using the first phrase; and receiving a query response from querying the knowledge base including receiving at least one of: a concept that identifies a problem, an action taken to resolve the problem, an activity performed during troubleshooting of the problem, a series of steps taken to arrive at a solution, or a conversation contained within the bug report.