NEST by Elastic and contributors

<PackageReference Include="NEST" Version="7.8.2" />

.NET API 4,648,448 bytes

 IStemmerOverrideTokenFilter

public interface IStemmerOverrideTokenFilter : ITokenFilter
Overrides stemming algorithms, by applying a custom mapping, then protecting these terms from being modified by stemmers. Must be placed before any stemming filters.
IEnumerable<string> Rules { get; set; }

A list of mapping rules to use.

string RulesPath { get; set; }

A path (either relative to config location, or absolute) to a list of mappings.