By default Solr ships with two configuration folders: _default, sample_techproducts_configs

If you look at "sample_techproducts_configs" folder, you can find the following files:

$ tree /opt/solr/server/solr/configsets/sample_techproducts_configs/conf/

/opt/solr/server/solr/configsets/sample_techproducts_configs/conf/
├── managed-schema
├── solrconfig.xml
├── currency.xml
├── elevate.xml
├── spellings.txt
├── stopwords.txt
├── synonyms.txt
├── mapping-FoldToASCII.txt
├── mapping-ISOLatin1Accent.txt
├── params.json
├── protwords.txt
├── _rest_managed.json
├── _schema_analysis_stopwords_english.json
├── _schema_analysis_synonyms_english.json
├── update-script.js
├── lang
│   ├── stopwords_en.txt
│   ├── contractions_fr.txt
│   ├── stemdict_nl.txt
│   ├── stoptags_ja.txt
│   └── userdict_ja.txt
│   ├── ...
└── xslt
    ├── ...

- The "managed-schema" file defines the schema for the collection/core index (fields names/types/analyzers).

- The "solrconfig.xml" file contains Solr configuration (libraries/plugins paths, request handlers, response writers, search components).

- The "lang" directory contains configuration files that can be specific to languages (stopwords, stoptags, stemdict, userdict, contractions, ...).

- The "xslt" directory contains XSLT files used to transform Solr query responses.

Other files:
- "elevate.xml"
- "spellings.txt"
- "synonyms.txt"
- "protwords.txt"
- "currency.xml"
- "mapping-FoldToASCII.txt"
- "mapping-ISOLatin1Accent.txt"
- "_rest_managed.json"
- "_schema_analysis_stopwords_english.json"
- "_schema_analysis_synonyms_english.json"