Changing Indexing Options for Milvus does not trigger re-indexing

Problem/Motivation

Changing Indexing Options for Milvus does not trigger re-indexing (it does for Pinecone already)

Steps to reproduce

Changing Indexing Options in the Search API Index -> Fields

Proposed resolution

Auto-queue all for re-indexing

Remaining tasks

MR

User interface changes

N/A

API changes

N/A

Data model changes

N/A