Stash thread context for every CRUD operation on .opendistro-job-scheduler-lock index

[joshpalis]

Is your feature request related to a problem?
Since Job Scheduler's lock index has been added to security plugin's list of protected indices (PR), it is necessary to stash the thread context for every CRUD operation on the lock index.

The following errors have been observed in dependent plugins that attempt to retrieve and release a lock from the lock index during job execution with security enabled.

org.opensearch.client.ResponseException: method [PUT], host [https://localhost:9200/], URI [_plugins/geospatial/ip2geo/datasource/updatedatasourceitnz], status line [HTTP/1.1 403 Forbidden]
    Warnings: [this request accesses system indices: [.opendistro-job-scheduler-lock], but in a future major version, direct access to system indices will be prevented by default]
    {"error":{"root_cause":[{"type":"security_exception","reason":"no permissions for [] and User [name=admin, backend_roles=[admin], requestedTenant=null]"}],"type":"security_exception","reason":"no permissions for [] and User [name=admin, backend_roles=[admin], requestedTenant=null]"},"status":403}
        at __randomizedtesting.SeedInfo.seed([2B29E33EB32391D4:5305C83A89F8B2E]:0)
        at app//org.opensearch.client.RestClient.convertResponse(RestClient.java:376)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:346)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:321)
        at app//org.opensearch.geospatial.GeospatialRestTestCase.createDatasource(GeospatialRestTestCase.java:122)
        at app//org.opensearch.geospatial.ip2geo.action.UpdateDatasourceIT.testUpdateDatasource_whenIncompatibleFields_thenFails(UpdateDatasourceIT.java:77)

Reference PR : #492

[joshpalis]

Closing as Job Scheduler's opendistro-job-scheduler-lock index has been removed from the security plugin's list protected indices for 3.x/2.x: opensearch-project/security#3383