8 files declare their use of FieldsProcessorPluginBase in Search API 8

HtmlFilter.php in src/Plugin/search_api/processor/HtmlFilter.php

IgnoreCase.php in src/Plugin/search_api/processor/IgnoreCase.php

IgnoreCharacters.php in src/Plugin/search_api/processor/IgnoreCharacters.php

Stemmer.php in src/Plugin/search_api/processor/Stemmer.php

Stopwords.php in src/Plugin/search_api/processor/Stopwords.php

TestFieldsProcessorPlugin.php in tests/src/Unit/Processor/TestFieldsProcessorPlugin.php

Tokenizer.php in src/Plugin/search_api/processor/Tokenizer.php

Transliteration.php in src/Plugin/search_api/processor/Transliteration.php