Can I set reserved words not to be searched


I'm replacing Index Server with Elasticsearch. In Index server there are mechanisms in place such that certain words are ignored under certain search conditions as an example:

In Index Server if I search using 'as' nothing will be returned, but if I search for 'ash' it will be returned. Similarly words like 'the', "and" and 'at' are all ignored. and how would i differentiate between 'IT' as in 'the IT department' and the word 'it' which Index server also seems to handle nicely.

Generally these "reserved words" are called "stop words." In elasticsearch, you can use the stop token filter

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