[Security Solution] update generateId function to use _seq_no and _primary_term

[ecezalp]

generateId in x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts uses _version value to create a hash. _version should be replaced with _seq_no and _primary_term for a more up-to-date implementation (details below)

One other thing is that I do not think the doc._version is the best usage of identifying unique document changes anymore within elastic.

In Saved Objects and other places if we are trying to identify if a document has changed and key off of that it's better to use _seq_no and _primary_term

Ref: https://www.elastic.co/guide/en/elasticsearch/reference/current/optimistic-concurrency-control.html

The caveat being we have to ensure we are passing the correct flags to return these two fields with our search results which you would have to check. You could fall back on doc._version if you do not see them being set to double check things or write an e2e test to ensure we do return them as expected as well at some point.

However, overall I think we have older deprecated patterns of using doc._version instead of using those two other fields and should prefer using those.

Let me know if that doesn't sound right.

Originally posted by @FrankHassanabad in #102106 (comment)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[ecezalp]

#119214

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)