[8.x] Add pipeline to clean docs during data stream reindex (#121617) #121730
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Add the pipeline "reindex-data-stream-pipeline" to the reindex request within ReindexDataStreamIndexAction. This cleans up documents as needed before inserting into the destination index. Currently, the pipeline only sets a timestamp field with a value of 0, if the document is missing a timestamp field. This is needed because existing indices which are added to a data stream may not contain a timestamp, but reindex validates that a timestamp field exists when creating data stream destination indices. This pipeline is managed by ES, but can be overriden by users if necessary. To do this, the version field of the pipeline should be set to a value higher than the MigrateRegistry version. (cherry picked from commit 29965bc) # Conflicts: # x-pack/plugin/migrate/src/internalClusterTest/java/org/elasticsearch/xpack/migrate/action/ReindexDatastreamIndexTransportActionIT.java
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