cradle-elastic: add page

pages/common/cradle-elastic.md

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+# cradle elastic
+
+> Manage the ElasticSearch instances.
+
+- Truncate the ElasticSearch index:
+
+`cradle elastic flush`
+
+- Truncate the ElasticSearch index for a specific package:
+
+`cradle elastic flush {{package}}`
+
+- Submit the ElasticSearch schema:
+
+`cradle elastic map`
+
+- Submit the ElasticSearch schema for a specific package:
+
+`cradle elastic map {{package}}`
+
+- Populate the ElasticSearch indexes for all packages:
+
+`cradle elastic populate`
+
+- Populate the ElasticSearch indexes for a specific package:
+
+`cradle elastic populate {{package}}`