What happens to my indexes when I publish hosted Feature Services?

[SimonJackson]

I have some services that I will be migrating from ArcGIS for Server to hosted Feature services on ArcGIS Online.
My web app has some QueryTasks that hit multiple fields in the services, and as a result I have created attribute indexes via ArcGIS for Desktop.

I was wondering if these attribute indexes carry across when I publish (and thus my data is copied) to my ArcGIS Online account?

[SafeTRECUCB]

Does any one have an answer for this question? I have the same question but couldn't find any information about this.