PropertyBase type is wrong

[fbaligand]

🐛 Wrong type

PropertyBase class is wrong, because every property in this class is not common to all property types:

• "meta" property is refused by Elasticsearch for "object" type
• "properties" property is refused by Elasticsearch for "text" type (and probably all non "object" types)
• "ignore_above" property is refused by Elasticsearch for numerous types, for instance "object" or even "text")
• "dynamic" property is refused by Elasticsearch for all non "object" types
• "fields" property is refused by Elasticsearch for "object" type

That's why this class should be removed, and all properties inside should be dispatched in more specific types.