@Field
    public void setEmbeddedFileFieldName(String embeddedFileFieldName) {
        this.embeddedFileFieldName = embeddedFileFieldName;
    }
If using the {@link AttachmentStrategy#PARENT_CHILD}, this is the field name
used to store the child documents.  Note that we artificially flatten all embedded
documents, no matter how nested in the container document, into direct children
of the root document.

@param embeddedFileFieldName
tika-pipes/tika-emitters/tika-emitter-solr/src/main/java/org/apache/tika/pipes/emitter/solr/SolrEmitter.java