[EPM] merge duplicate fields when creating index patterns#60957

Merged

neptunian merged 3 commits intoelastic:masterfrom

neptunian:56306-handle-dupes-index-patterns

Mar 24, 2020

Commits on Mar 23, 2020

fix bug where an already installed packaged was installed twice through endpoint
neptunian
committed
fix bug where dataset like network and network_summary were not differentiated
neptunian
committed
handle duplicate fields by merging fields of the same type
neptunian
committed