The below Esri docs show that it is possible to manually set service indices from the source mxd/ArcGIS Pro project:
https://desktop.arcgis.com/en/arcmap/latest/map/publish-map-services/map-authoring-considerations.htm#ESRI_SECTION1_4C54586DEB0445B4B97AF15856E546AB
Problem: Pop-ups for feature layers in a web map are switched after overwriting a feature service
https://support.esri.com/en/technical-article/000016891
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