Additional metrics for elasticsearch PMDA

[Ryan Doyle <rdoyle@xxxxxxxxxx>]

Hi All, 

Please see attached patch for additional index metrics for the elasticsearch PMDA.

It is not as clean as I would like it but that stems from how these metrics are exported from the elasticsearch status API:

Heres a nice output

{

    "_all": {

        "indices": {

            "qa4": {

                "primaries": {

                    "search": {

                        "fetch_current": 0, 

                        "fetch_time": "0s", 

Where all hash keys map directly to the elasticsearch PMID name (EG: primaries.search.fetch_current). We take advantage of this in the PMDA using the es_value function and passing in a reference to the metric requested where each array member is separated by a period.

Unfortunately, the settings hash does not follow the same convention and has periods in the key! EG:

 }, 

                "settings": {

                    "index.gateway.snapshot_interval": "10000", 

                    "index.number_of_replicas": "1", 

                    "index.number_of_shards": "5", 

                    "index.version.created": "190199"

                }, 

This makes the code less clean, but it looks like these are the only 4 metrics that follow this convention.

Cheers!

----
Ryan Doyle

elasticsearch-PMDA-implement-index-settings.patch
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