[SPARK] SparkContextFunctions.esRDD parameters

[randallwhitman]

Add an overload with all the three parameters available with
EsSpark.esRDD(..., resource, query, cfg).
Likewise for esJsonRDD.

This change makes SparkContextFunctions.esRDD more consistent with SQLContextFunctions.esDF which already has an overload taking all 3 parameters.

Implements #592.

[costin]

@randallwhitman I was about to push a commit fixing the issue. Can you please sign the CLA so I can use your PR instead?

Thanks,

[randallwhitman]

Probably, but if you already have a commit prepared, wouldn't that be easier than processing a CLA?

[costin]

The CLA should be processed automatically. As for the commit, you already went through the process of providing a fix, plus reporting the bug and I think it would be a good way to recognize your efforts by including your work in the project.
Let me know what option you prefer.

Cheers,

[randallwhitman]

Thanks Costin - that makes sense, and I appreciate it.

Because I made the patch while working for my employer on integration with Elasticsearch, the CLA would have to go through some corporate process.

In this case it may be in our mutual interest to close this PR without merging, and use your independent commit.