Also see Breaking changes in 5.6.
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Aggregations
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Do not delegate a null scorer to LeafBucketCollectors #26747 (issue: #26611)
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Inner Hits
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Do not allow inner hits that fetch _source and have a non nested object field as parent #25749 (issue: #25315)
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Internal
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Catch exceptions and inform handler in RemoteClusterConnection#collectNodes #26725 (issue: #26700)
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Java API
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BulkProcessor flush runnable preserves the thread context from creation time #26718 (issue: #26596)
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Java High Level REST Client
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Make RestHighLevelClient’s Request class public #26627 (issue: #26455)
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Plugin Analysis Kuromoji
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Plugin Repository HDFS
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Fix permission errors when using Read Only HDFS Repository #26714 (issues: #22793, #26513)
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Query DSL
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#26083 Fixed incomplete JSON body on count request making org.elasticsearch.rest.action.RestActions#parseTopLevelQueryBuilder go into endless loop #26680 (issue: #26083)
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Scripting
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Add missing script contexts and types allowed settings #26703 (issue: #26651)
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Upgrade API
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Upgrade API: fix excessive logging and unnecessary template updates #26698 (issue: #26673)