If a type or path is missing in the REST test yaml file, it is
automatically replaced with _all. This makes it hard to test changes
in the api, for example adding the possibility to leave the index
blank in addition to _all and * in the uri.
closes#4657
This should make easier any potential expansion such as:
client.update('index', 'type', 41, {...}, ignore: 409
Also restructured and renamed the test suite a bit as part of the commit.
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This reverts commit 0b142cc8812d8d090e48ea0ad89c007767870b91, "Removed client-specific `ignore_missing` parameter".