# Elasticsearch 6

This page describes the Optimization Pack for the component type Elasticsearch 6.

## Metrics

| Metric                                 | Unit         | Description                                                                                                      |
| -------------------------------------- | ------------ | ---------------------------------------------------------------------------------------------------------------- |
| es\_cluster\_search\_query\_time       | milliseconds | The average search query time of elasticsearch                                                                   |
| es\_cluster\_search\_query\_throughput | queries/s    | The throughput of elasticsearch in terms of search queries per second                                            |
| es\_cluster\_active\_shards            | shards       | The total number of active shards (including replica shards) across all indices within the elasticsearch cluster |
| es\_cluster\_status                    | flag         | The status of the elasticsearch search cluster, red = 0, yellow = 1, green = 2                                   |
| es\_cluster\_out\_packets              | packets/s    | The number of packets per second transmitted outside of the elasticsearch cluster                                |
| es\_cluster\_out\_bytes                | bytes/s      | The number of bytes per second transmitted outside of the elasticsearch cluster                                  |
| es\_cluster\_in\_packets               | packets/s    | The number of packets per second received by the elasticsearch cluster                                           |
| es\_cluster\_in\_bytes                 | bytes/s      | The number of bytes per second received by the elasticsearch cluster                                             |
| es\_node\_process\_open\_files         | files        | The total number of file descriptors opened by the elasticsearch process within the elasticsearch node           |
| es\_node\_process\_cpu\_util           | percentage   | The CPU utilization % of the elasticsearch process within the elasticsearch node                                 |
| es\_node\_process\_jvm\_gc\_duration   | milliseconds | The average duration of jvm garbage collection for the eleasticearch process                                     |
| es\_node\_process\_jvm\_gc\_count      | gcs          | The total number of jvm garbage collections that have occurred for the elasticsearch process in the node         |

## Parameters

| Parameter                                      | Type    | Unit      | Default value | Domain         | Restart | Description                                              |
| ---------------------------------------------- | ------- | --------- | ------------- | -------------- | ------- | -------------------------------------------------------- |
| index\_merge\_scheduler\_max\_thread\_count    | integer | threads   | `3`           | `1` → `10`     |         | ElasticSearch max number of threads for merge operations |
| indices\_store\_throttle\_max\_bytes\_per\_sec | integer | bytes/s   | `20`          | `10` → `500`   |         | ElasticSearch max bandwidth for store operations.        |
| index\_translog\_flush\_threshold\_size        | integer | megabytes | `512`         | `256` → `1024` |         | ElasticSearch flush threshold size.                      |
| index\_refresh\_interval                       | integer | seconds   | `1`           | `10` → `30`    |         | ElasticSearch refresh interval.                          |
| index\_number\_of\_shards                      | integer | shards    | `5`           | `1` → `10`     |         | ElasticSearch number of shards.                          |
| index\_number\_of\_replicas                    | integer | replicas  | `1`           | `0` → `1`      |         | ElasticSearch number of replicas.                        |


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