Don't assume fixed earth diameter in the geo-distance bounding box optimization.

We switched to Lucene's SloppyMath way of computing an approximate value of
the eath diameter given a latitude in order to compute distances, yet the
bounding box optimization of the geo distance filter still assumed a constant
earth diameter, equal to the average.

Close #6008
Update asciifolding-tokenfilter.asciidoc

Typo
Update getting-started.asciidoc

Fixed "Jone Done" to "Jone Doe"
[DOCS] Updated the mapping and field mapping docs to use the new format

Closes #6057
Lower initial sizing of sub aggregations.

We currently compute initial sizings based on the cardinality of our fields.
This can be highly exagerated for sub aggregations, for example if there is a
parent terms aggregation that is executed over a field that has a very long
tail: most buckets will only collect a couple of documents.

Close #5994
[DOCS] Added vertx elasticsearch integration
Correcting gramma