Police reports are used to report crimes, and of course accident reports. If a crime is being reported, then a report must be generated by the responding officer. Police Officers respond to a large variety of calls including disputes, civil issues, neighbor complaints, animals, medical cases, HOLMES 2 (Home Office Large Major Enquiry System) is an information technology system that is predominantly used by UK police forces for the investigation of major incidents such as serial murders and high value frauds. What is StringIndexer , VectorIndexer, and how to use them? Ask Question Asked 2 years, 5 Vector Indexer- use this if we do not know the types of data incoming. so we leave the logic of differentiating between categorical and non categorical data to the algorithm using Vector Indexer. What does the stainless steel plug do in the E3D