You may have heard about synonyms—words that have the same or similar meaning. Sometimes, you will want to have some words match when one of those words is entered into the search box. Let's recall our sample data from The example data section of Chapter 3, Searching Your Data; there was a book called
Crime and Punishment. What if we want that book to be matched not only when the words
punishment are used, but also when using words like
abuse. To perform this, we will use synonyms.
In order to use the
synonym filter, we need to define our own analyzer. Our analyzer will be called
synonym and will use the
whitespace tokenizer and a single filter called
synonym. Our filter's ...