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New Features:
- supports for elasticsearch has been added. Now many basic `fhir search <https://www.hl7.org/fhir/search.html>`_ are possible to be queried.
- upto 22 FHIR fields indexes (`FhirActivityDefinitionIndex`, `FhirAppointmentIndex`, `FhirCarePlanIndex`, `FhirDeviceIndex`, `FhirDeviceRequestIndex`, `FhirHealthcareServiceIndex`, `FhirMedicationAdministrationIndex`, `FhirMedicationDispenseIndex`, `FhirMedicationRequestIndex`, `FhirMedicationStatementIndex`, `FhirObservationIndex`, `FhirOrganizationIndex`, `FhirPatientIndex`, `FhirPlanDefinitionIndex`, `FhirPractitionerIndex`, `FhirProcedureRequestIndex`, `FhirQuestionnaireIndex`, `FhirQuestionnaireResponseIndex`, `FhirRelatedPersonIndex`, `FhirTaskIndex`, `FhirValueSetIndex`)
- Mappings for all available fhir indexes are created.
- `elasticsearch` option is now available for setup.py