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@@ -563,7 +563,7 @@ The following Similarities are configured out-of-box:
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Adding `copy_to` parameter to any field mapping will cause all values of this field to be copied to fields specified in
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the parameter. In the following example all values from fields `title` and `abstract` will be copied to the field
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-`meta_data`.
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+`meta_data`. The field which is being copied to will be indexed (i.e. searchable, and available through `fielddata_field`) but the original source will not be modified.
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[source,js]
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Robin Clarke