bug 1706171: fix phc fields in elasticsaerch
bug 1706171: fix phc fields in elasticsaerch

These didn't have a storage_mapping set, so they used to get indexed
with the default which is {"type": "string"}.

However, because most crash reports don't have PHC annotations and
phc_kind had no storage_mapping set so it wasn't specified in the
mapping when new indices were created, most of the PHC annotation values
were being removed before being indexed.

This fixes that by setting the storage_mapping so the PHC fields get
indexed.

lonnen/socorro,lonnen/socorro,lonnen/socorro,lonnen/socorro