updated api to use correct linkPublicationDate
fixed scholexplorer to use the new datamodel
fixed url resolver
fixed npe on source side
fixed npe
fixed bug of null publisher
implemented migration to elasticsearch 7.X
created new branch for elasticsearch 7.5
added filter by sourceType and TargetType to the api
fixed links from pid
fixed ui path
reverted ScholixConnector
fixed error on missing collectedFrom
removed wrong log
fixed wrong copy and paste that raise an error
fixed dependency
fixed problem on version of es
change log to write in stdout
added prometheus extension
added requirements.txt
fixed connection usage
edited ignore properties
added ignored properties
files added
created a new branch for the dli api that use new version of python and FastApi frameworks