Indexing / More robust

[fxprunayre]

• Dublin core / Multiple title / Only first one indexed (it will be better managed in DCAT2 plugin providing multilingual support).

• Invalid role value {{role}} trying to create an invalid field name.

GNIDX-XSL||Invalid element name. Invalid QName {{{role}}OrgForResource} (42)

• Multiple phones - only the first one is indexed

Error on line 1169 of index.xsl:
  XTTE0790: A sequence of more than one item is not allowed as the first argument of
  gn-fn-index:json-escape() ("02 38 42 24 55", "06 31 14 98 21")

• Date parsing - more flexible with support for 20170322, 2015-10-18T19:59:30.2675269Z (nanoseconds)

Error parsing ISO DateTimes '20170322'. Error is: Text '20170322' could not be parsed: Unable to obtain ZonedDateTime from TemporalAccessor: {},ISO resolved to 2017-03-22 of type java.time.format.Parsed

• Email / JSON character to escape. Only one email per contact is indexed.

Parsing invalid JSON node { "organisation":"Direction régionale de l'environnement, de l'aménagement et du logement Centre-Val de Loire", "role":"owner", "email":"###Paramètre "adresse email" dans la fonction "Services INSPIRE"", "website":"", "logo":"", "individual":"", "position":"", "phone":"", "address":"" } for property contactForResource. Error is: Unexpected character ('a' (code 97)): was expecting comma to separate Object entries
 at [Source: (String)"{