8 classes are annotated with SolrConnector in Search API Solr 4.x

BasicAuthSolrCloudConnector in src/Plugin/SolrConnector/BasicAuthSolrCloudConnector.php

Basic auth Solr connector.

BasicAuthSolrConnector in src/Plugin/SolrConnector/BasicAuthSolrConnector.php

Basic auth Solr connector.

BasicAuthTestSolrCloudConnector in tests/modules/search_api_solr_test/src/Plugin/SolrConnector/BasicAuthTestSolrCloudConnector.php

Basic auth Solr test connector.

BasicAuthTestSolrConnector in tests/modules/search_api_solr_test/src/Plugin/SolrConnector/BasicAuthTestSolrConnector.php

Basic auth Solr test connector.

Solr36Connector in modules/search_api_solr_legacy/src/Plugin/SolrConnector/Solr36Connector.php

Class Solr36Connector.

Solr36TestConnector in modules/search_api_solr_legacy/tests/modules/search_api_solr_legacy_test/src/Plugin/SolrConnector/Solr36TestConnector.php

Solr 36 test connector.

StandardSolrCloudConnector in src/Plugin/SolrConnector/StandardSolrCloudConnector.php

Standard Solr Cloud connector.

StandardSolrConnector in src/Plugin/SolrConnector/StandardSolrConnector.php

Standard Solr connector.