question: return the shardid that holds the given segment , or null if this segment is not tracked . concode_field_sep Map<Object,ShardId> coreKeyToShard concode_elem_sep Multimap<String,Object> indexToCoreKey concode_field_sep void add concode_elem_sep int size concode_elem_sep Set<Object> getCoreKeysForIndex
target: ShardId function ( Object arg0 ) { return coreKeyToShard . get ( arg0 ) ; }