[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

+148-378

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