Solr index vs stored

Question

I am a little confused as to what the behaviour of the index and stored attibutes of the Solr fields is.

For example if I have the following in the Schema.xml

Answer 1

The main point of having both set to false is to explicitly skip that particular field.

For example, if you have a storing/indexing dynamicField mapping and you want to ignore one particular name that would otherwise fall under dynamicField's pattern.

Alternatively you could use dynamicField to ignore a whole set of fields with same prefix/suffix that comes from a 3rd party. For example, Tika will send you a whole bunch of metadata fields which you may just want to ignore. See this defined in Solr's example schema.xml and used in solrconfig.xml

In the later versions of Solr, you could also use IgnoreFieldUpdateProcessorFactory (see full list for others) instead, which will get rid of those fields even earlier in the indexing process.