I would be worried if you didn't hear it in the future 🙂 As long as it still starts and doesn't slow down which could suggest it is starting to bind on the shaft then it should be fine
Alternatively, a new starter isn't that much and easy to fit
https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=131090&_nkw=2015+k13+micra+starter+motor&selvel=Cars+Year%3A2015%2CCar+Make%3ANissan%2CModel%3AMicra%2CVariant%3APetrol%20Hatch%2CCars+Type%3A1.2%2CBodyStyle%3AFWD%20IV%20K13K%2CMK13K_%2CPlat_Gen%3AMK%20IV%2CEngine%3A1198cc%2056KW%2076HP%20HR12DE&selcontext=productType%3ACAR_AND_TRUCK%2CpartType%3APARTS%2CqueryType%3ABY_VEHICLE&_sop=15&rt=nc&LH_ItemCondition=3