Deprecate word_delimiter tokenfilter in favour of word_delimiter_graph

[romseygeek]

WordDelimiterFilter is already deprecated in lucene, and can mess up offsets and highlighting (see #28474 and #3511)

[elasticmachine]

Pinging @elastic/es-search-aggs

[ebuildy]

For now, what about throwing a warning message, when using word_delimiter and preserve_original at index creation? this could help to prevent real error at index time later (hence in our case, save lot of time ...).