Query no matches on .kibana instead of .kibana-devnull #7286
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The devnull query was always a big hack to try to force Elasticsearch
into giving us an empty search response when we know there are no
indices that match the current search in the current timeframe. That
hack does not work in all situations, for example if someone creates an
index called .kibana-devnull or doesn't enable access to that index
pattern in shield.
We know users must have access to the kibana index, so it should be safe
to query it, and we know we can force an empty response by doing a
must_not match_all boolean query, so that's what we do here.
Performance shouldn't be an issue since the kibana index is just storing
kibana meta data, configurations, and saved objects.