Here's an interesting article on Vector Databases: 

https://dev.to/pavanbelagatti/wtf-is-a-vector-database-a-beginners-guide...

You should take a look at this alternative Open Source Node.js client for IRIS: mg_dbx:

https://github.com/chrisemunt/mg-dbx

It provides significantly better performance.

To use its synchronous APIs safely you need to look at either:

- QEWD: https://github.com/robtweed/qewd

- qoper8-fastify: https://github.com/robtweed/qoper8-fastify/blob/master/IRIS.md

Well it only took 13 years for the idea to be taken up.

https://www.mgateway.com/documents/universalNoSQL.pdf