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Single document update is quite possible! No worries there.
Since you’re using DIH (data import handler) you can use the delta-import
command, see
https://cwiki.apache.org/confluence/display/solr/Uploading+Structured+Data+Store+Data+with+the+Data+Import+Handler#UploadingStructuredDataStoreData
I am having an index file which contains the data from mysql database, I
created this index file using dataimporthandler of solr. My requirement is,
suppose if i add a new row to database, I want to update that row in my
existing index file of solr. I dont have any idea how to add the new record