Gradle task equivalent to ant's "change-to-html" [LUCENE-9333]

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Migrated from LUCENE-9333 by Tomoko Uchida (@mocobeta), resolved Apr 30 2020
Linked issues:

• Port documentation task to gradle [LUCENE-9321] #10361

Pull requests: apache/lucene-solr#1468

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ASF subversion and git services (migrated from JIRA)

Commit 5354f7e in lucene-solr's branch refs/heads/master from Tomoko Uchida
https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=5354f7e

LUCENE-9333: Add gradle task to compile changes.txt to a html (#1468)

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ASF subversion and git services (migrated from JIRA)

Commit 10d1ecb in lucene-solr's branch refs/heads/master from Tomoko Uchida
https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=10d1ecb

LUCENE-9333: lazily evaluate for 'docroot' property

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ASF subversion and git services (migrated from JIRA)

Commit 51c15b8 in lucene-solr's branch refs/heads/master from Tomoko Uchida
https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=51c15b8

LUCENE-9333: Use DirectoryProperty instead of directly having Provider; move script file to input field.

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Adrien Grand (@jpountz) (migrated from JIRA)

Closing after the 9.0.0 release