Node.js v6 will go EOL at the end of April 2019, and already two of the production dependencies of the client have already dropped support for it, and soon others will do *(as well as development dependencies)*.
Furthermore, since Node.js will go in EOL it will never get security patches, plus, also OpenSSL-1.0.2 will go EOL [this year](https://github.com/nodejs/Release#release-schedule); to avoid risks for the client users it is better to drop support for Node.js v6 right away.
The ingest docs in Elasticsearch doing point to the actual ingest APIs.
This makes up generate links to the real APIs instead, fixing some
broken links in the 5.x docs in the process.
Handles a few "special" doc urls from ES's api spec files. These are
only a problem in 6.x but we'd like to keep the generateDocs script the
same across all branches for easier backporting.
Handles `console.log` and `utils.inspect` invocations for a better debugging experience.
`agent` and `ssl` are hidden since they made the logs very hard to read.
The user can still access them with `instance.agent` and `instance.ssl`.
In very few cases, some API uses the same key for both url and query params, such as the bulk method.
The client is not designed to handle such cases since accepts both url and query keys in the same object, and the url parameter will always take precedence.
This pr fixes this edge case by adding a `querystring` key in the options object.
Fixes: https://github.com/elastic/elasticsearch-js/pull/778
```js
client.bulk({
index: 'index',
type: '_doc',
body: [...]
}, {
querystring: {
type: '_doc'
}
}, console.log)
```
