Remove type when connecting to ES 7 and user doesn't specify it
#994
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With ES 7.10.0 a deprecation log line about types removal is printed for each request (index/bulk) that contains the deprecated index
_type.This led to possible flood of deprecation logs on Elasticsearch, tracked in elastic/elasticsearch#69188.
This commit removes the implicit set of type when connected to ES7 unless the user doesn't specify explicitly the type.
Related to #915