Query sends wrong query if hitting Enter to fast

[timroes]

Kibana version: 6.3.0+

When enabling Kuery in the query bar from 6.3 onwards, the query box will have a delay in applying it's value when you hit Enter fast.

For example I type: extension:png, wait shortly hit Enter everything is fine.

If you now change the png to php and hit enter rather fast after typing php, you might end up in a situation where the query that is actually send will just be extension:p. That's not limited to any specific field(type), but happened in my tests whenever Kuery was enabled and you hit Enter fast while typing.

That of course will lead to wrong data being displayed, in contrast to what the user see in the query bar. If you go back to the query bar and just hit enter again, now the correct data would be send.

The issue is still present on master.

[timroes]

cc @elastic/kibana-discovery