How to change Solr document id by SolrJ?

问题:

I use the following code to change specific field value.

SolrInputDocument solrdoc=new SolrInputDocument();
solrdoc.addField("id","book001");
Map<String,Object> fieldModifier=new HashMap<>(1);
fieldModifier.put("set","book_new_name");
solrdoc.addField("name",fieldModifier); 

But I cannot use the similar code to change Solr unique document id, exception is thrown.

solrdoc.addField("id",fieldModifier); 

Is there any solution to change the Solr document id?

回答1:

Changing the document id requires removing and re-adding the document, so delete the document (by id), then re-add the document with the new id. You can do this without committing between deleting and adding the document, so it will be seamless for any clients querying the collection.