There was a park in the town in Virginia where I used to live that had been a railroad track that was turned into a walking path. At one place near that track was a historic turntable where cargo trains might be unloaded so that they could be added to later trains or trains headed in the opposite direction. This is a technology that is no longer used but it is an example of how technology changes and evolves over time.
Latent Semantic Indexing is Old Technology
Some people claim that Google is using Latent Semantic Indexing because they believe that by saying that they are saying that Google is using synonyms and semantically related words.