Today:
App-A --> Owns and performs CRUD operations on the data from Domain-A (data is captured in a Relational DB Schema-A)
App-B --> Owns and performs CRUD operations on the data from Domain-B (data is captured in a Relational DB Schema-B)
App-C --> Owns and performs CRUD operations on the data from Domain-C (data is captured in a Relational DB Schema-C)
All of the above Apps A,B and C also use their own Embedded Elastic Search instance to help with their respective search operations.
Future:
Down the line, we'd like to switch Apps A,B,C out of their respective embedded Elastic Search instances and use External Elastic Search instance.
Question:
When we do the above:
i) Do we need to have 3 separate external Elastic Search Instances, one per App?
ii) Or a Single Centralized Elastic Search Instance that all 3 Apps can point to and use the centralized Elastic Search instance for their respective search operations?
iii) Any pointers or Best Practices with accomplishing the above migration?