elektron refinitiv-realtime eta-api elektron-sdk rrt elektron-transport-api java rssl c++ rcc-api connection source-directory symbology trep batch log-in api fields c ssl consumer reactor rdm Service eikon ETA market-feed rics callback token status DACS elektron-data-dictionary ADS market-by-price linux non-interactive-provider rcc ipa snapshot-pricing rdf sink-driven-source sequence stream-id encoding error docker performance ADH service-name events 64-bit multi-threading mrn time-stamp conflation stale chain-ric enum open-source service discovery OMM elektron-direct-feed equities message commodities exchanges fanout contributions monitoring failover stress-test service-dictionary data-model aws build unsubscribe api-limits constituents volume service-id trade pricing dispatch documentation quote tick-history-rest-api search rfa load-balancing compile refresh-message subscription