Revert "fix; changed readme.md info snapshots collector (prometheus-community#891)"

This reverts commit 10d9ccd.

Author: jaimeyh

README.md

@@ -58,7 +58,7 @@ elasticsearch_exporter --help
 | es.indices_mappings     | 1.2.0                 | If true, query stats for mappings of all indices of the cluster.                                                                                                                                                                                                                                                                                                                      | false |
 | es.aliases              | 1.0.4rc1              | If true, include informational aliases metrics.                                                                                                                                                                                                                                                                                                                                       | true |
 | es.shards               | 1.0.3rc1              | If true, query stats for all indices in the cluster, including shard-level stats (implies `es.indices=true`).                                                                                                                                                                                                                                                                         | false |
-| collector.snapshots     | 1.0.4rc1              | If true, query stats for the cluster snapshots. (As of v1.7.0, this flag has replaced "es.snapshots").                                                                                                                                                                                                                                                                                | false |
+| es.snapshots            | 1.0.4rc1              | If true, query stats for the cluster snapshots.                                                                                                                                                                                                                                                                                                                                       | false |
 | es.slm                  |                       | If true, query stats for SLM.                                                                                                                                                                                                                                                                                                                                                         | false |
 | es.data_stream          |                       | If true, query state for Data Steams.                                                                                                                                                                                                                                                                                                                                                 | false |
 | es.timeout              | 1.0.2                 | Timeout for trying to get stats from Elasticsearch. (ex: 20s)                                                                                                                                                                                                                                                                                                                         | 5s |