Add ES fields for genre and subgenre data
Add ES fields for genre and subgenre data

Two fields were added to events, one to store genres and one to store
subgenres. We need this information, because we want to be able to
aggregate over them. Genres and subgenres are stored as tags
(non-analyzed strings).

NLeSC/embodied-emotions-scripts,NLeSC/embodied-emotions-scripts