Update reindex.asciidoc (#35062)
Highlighted that `_source` needs to exist in the source index.
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[[docs-reindex]]
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[[docs-reindex]]
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== Reindex API
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== Reindex API
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IMPORTANT: Reindex requires <<mapping-source-field,`_source`>> to be enabled for
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all documents in the source index.
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IMPORTANT: Reindex does not attempt to set up the destination index. It does
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IMPORTANT: Reindex does not attempt to set up the destination index. It does
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not copy the settings of the source index. You should set up the destination
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not copy the settings of the source index. You should set up the destination
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index prior to running a `_reindex` action, including setting up mappings, shard
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index prior to running a `_reindex` action, including setting up mappings, shard
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