The first one is not available, however a terms aggregation and sort by
_count asc will bubble up the least frequent terms (emails) and you can
filter yourself which ones you want. The second one sounds like a simple
terms aggregation on the email field (just make sure the email field is
not_analyzed):
{
"aggs": {
"group_by_email": {
"terms": {
"field": "email"
}
}
}
}
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