Adds match filter

[madalinignisca]

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It is compatible with ES 6.x, and quite important.

PS: if you look in 7.x docs, the syntax is actually slightly changed, and will refuse it in 8.x (as a note for V4.x which still does ES communication with 6.x syntax. Probably v4 could be both tested using ES 6 and 7. I do not find yet any justifiable differences for the purpose of this package.

[madalinignisca]

by the way, could you rename the branch to 3.x? I'd like to maintain on it, and backport any possible thing. In Laravel's 6 world, I'm stuck on ES 6. (Check Monolog as well :) )