[doc] Remove external herokuapp website link (#77405) (#77426)

Backports the following commits to 7.15: [doc] Remove external herokuapp website link ([doc] Remove external herokuapp website link #77405)
elastic · Sep 8, 2021 · 24770ce · 24770ce
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commit 24770ce
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diff --git a/docs/reference/migration/migrate_7_0/migrate_to_java_time.asciidoc b/docs/reference/migration/migrate_7_0/migrate_to_java_time.asciidoc
@@ -231,9 +231,6 @@ In java time, `z` outputs 'Z' for Zulu when given a UTC timezone.
 We strongly recommend you test any date format changes using real data before
 deploying in production.
 
-For help with date debugging, consider using
-https://esddd.herokuapp.com/[https://esddd.herokuapp.com/.]
-
 [[java-time-migrate-update-mappings]]
 ==== Update index mappings
 To update joda-time date formats in index mappings, you must create a new index