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Keep only one value: if multiple matches are found during the extraction and if this optional field is set to true, then only the first one will be kept in the destination metadata. This parameter only applies if "Value if match" is empty.
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The source metadata must be “content”, “url” or any ManifoldCF document field provided by your Repository Connector. The destination metadata must exist in Solr environment (no check done). Depending on your regular expression, several different values may be found in a document, so the metadata receiving the results must be multi-valued, otherwise it will contain the last match found. If the checkbox “Keep only one value” is set to true or if “Value if true” is specified, then only one value will be used.
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