Update reindex.asciidoc (#35062)

Highlighted that `_source` needs to exist in the source index.
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markwalkom 2018-10-30 20:22:42 +11:00 committed by Luca Cavanna
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[[docs-reindex]] [[docs-reindex]]
== Reindex API == Reindex API
IMPORTANT: Reindex requires <<mapping-source-field,`_source`>> to be enabled for
all documents in the source index.
IMPORTANT: Reindex does not attempt to set up the destination index. It does IMPORTANT: Reindex does not attempt to set up the destination index. It does
not copy the settings of the source index. You should set up the destination not copy the settings of the source index. You should set up the destination
index prior to running a `_reindex` action, including setting up mappings, shard index prior to running a `_reindex` action, including setting up mappings, shard