[RAM] replaces savedObjectClient.bulkUpdate with bulkCreate method in RulesClient.bulkEdit

[vitaliidm]

Summary

savedObjectClient.bulkUpdate method uses ES _bulk API with update action, which doesn’t allow to delete fields from Saved Objects(SO), i.e. overwrite them with undefined
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html

Instead, in this PR it replaced by savedObjectClient.bulkCreate with overwrite=true, that allows to remove existing fields by complete overwrite of SOs. It results in _bulk API query index action

Checklist

Delete any items that are not applicable to this PR.

• Unit or functional tests were updated or added to match the most common scenarios

[vitaliidm]

Simple example with _bulk update/index actions on SO(can be run in Kibana dev tools)

// create index
PUT /timeline-issue
{
  "settings": {
    "number_of_shards": 1
  },
  "mappings": {
    "properties": {
      "params": {  "type": "flattened" }
    }
  }
}

// add new SO
POST /timeline-issue/_doc/1
{
  "params": {
    "description": "test SO 1",
    "timelineTitle": "Test TT"
  }
}

// rewrite values in SO by using _bulk, see timelineTitle changed to new value
POST /_bulk?refresh=wait_for&_source=true
{"update":{"_id":"1","_index":"timeline-issue"}}
{"doc":{"params":{"description": "test SO 1","timelineTitle": "Test TT Bulk"}}}

// rewrite values in SO by using _bulk, see timelineTitle has not benn rewritten
POST /_bulk?refresh=wait_for&_source=true
{"update":{"_id":"1","_index":"timeline-issue"}}
{"doc":{"params":{"description": "test SO 2"}}}

// simple put on contrary rewrites field if it's undefined
PUT /timeline-issue/_doc/1
{
  "params": {
    "description": "test SO 1"
  }
}

// it's possible to remove fields by using "index" action
GET /timeline-issue/_doc/1
POST /_bulk?refresh=wait_for&_source=true
{"index":{"_id":"1","_index":"timeline-issue"}}
{"doc":{"params":{"description": "test SO 5"}}}

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 2367ffd

Metrics [docs]

✅ unchanged

History

• 💔 Build #62683 failed 0452e5c
• 💚 Build #62382 succeeded b3fff3c
• 💚 Build #61758 succeeded ac167bb

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @vitaliidm

[pmuellr]

LGTM

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.4

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