Hello, Sinan, I hold the opposite view on this matter. There is no need to provide the index parameter for this admin API, just as there is no need to add an index as a parameter for every interface that uses message ID as an input.
If a user chooses to use an index instead of a message ID, they should maintain the mapping relationship between the message ID and the index themselves. Pulsar's APIs, however, should exclusively use the message ID as a parameter. PIP-415 exists exactly to assist users in maintaining this mapping relationship between message IDs and indices. BR, Xiangying
