Minimum Equella version supported by EBI

[goetzk]

bulkImporterUserManual.md says the API used is 5.1, but the api contains this reference:

# The EQUELLA SOAP abstraction layer for the EQUELLA Bulk Importer. Effectively a wrapper
# for EQUELLA's SOAP API for invocation by Engine.py. Includes the necessary HTTP network
# plumbing. To support EQUELLA down to version 4.1 it uses the EQUELLA 4.1 API and endpoint
# for the majority of functionality. Some functions included for features supported only in
# higher versions of EQUELLA (e.g. control of item ownership for 5.1+).

I haven't attempted to validate which calls available on specific Equella versions but I'm flagging this up in case someone familiar with the API can suggest some new wording.

Edit:
A quick search found 5 references to the V51 endpoint

            ), 1, SOAP_ENDPOINT_V51)
            ), 1, facade = SOAP_ENDPOINT_V51)
            ), 1, facade = SOAP_ENDPOINT_V51)
            ), 1, SOAP_ENDPOINT_V51)