getDocument
suspend fun SearchClient.getDocument( target: String, id: String, preference: String? = null, realtime: Boolean? = null, refresh: Refresh? = null, routing: String? = null, storedFields: String? = null, source: String? = null, sourceExcludes: String? = null, sourceIncludes: String? = null, version: Long? = null, versionType: VersionType? = null, extraParameters: Map<String, String>? = null): GetDocumentResponse