Support for mapping update for the replication store system index

[saikaranam-amazon]

Description

Support for mapping update for the replication store system index

Issues Resolved

N/A

Testing

./gradlew clean release 

Manually tested on cluster
Before

curl "localhost:9200/.replication-metadata-store/_mapping?pretty"
{
  ".replication-metadata-store" : {
    "mappings" : {
      "dynamic" : "strict",
      "_meta" : {
        "schema_version" : 1
      },

After

curl "localhost:9200/.replication-metadata-store/_mapping?pretty"
{
  ".replication-metadata-store" : {
    "mappings" : {
      "dynamic" : "strict",
      "_meta" : {
        "schema_version" : 3
      },
      "properties" : {
        "connection_name" : {
          

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[krishna-ggk]

It would be great to include tests to confirm schema version can be safely updated. Can you assess if it is introduce able now or requires significant plumbing work?

[saikaranam-amazon]

It would be great to include tests to confirm schema version can be safely updated. Can you assess if it is introduce able now or requires significant plumbing work?

Added issue to track UTs: #113

[naveenpajjuri]

LGTM