What is MobileSMSSpotlightImporterCatalyst on macOS?

/System/Applications/Messages.app/Contents/PlugIns/MobileSMSSpotlightImporterCatalyst.appex/Contents/MacOS/MobileSMSSpotlightImporterCatalyst

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The binary is a part of MobileSMSSpotlightImporterCatalyst application.