set indices in json

[kapsner]

For better performance, set indices on json-items to enhance user-experience and speed when joining:

Patient-ID, e.g.:

• Patient.DATA ->> 'id'
• REPLACE(jsonb_path_query(Encounter.DATA, '$.subject') ->> 'reference', 'Patient/', '')

Encounter-ID, e.g.:

• Encounter.DATA ->> 'id'
• REPLACE(Condition.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')
• REPLACE(Procedure.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')
• REPLACE(Observation.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')