diff --git a/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.cpp b/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.cpp
index 7ee9f284f3f6..49d5fc4e42b1 100644
--- a/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.cpp
+++ b/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.cpp
@@ -14,8 +14,8 @@ namespace proton {
 DiskIndexWrapper::DiskIndexWrapper(const std::string &indexDir,
                                    const TuneFileSearch &tuneFileSearch,
                                    std::shared_ptr<IPostingListCache> posting_list_cache,
-                                   size_t cacheSize)
-    : _index(indexDir, std::move(posting_list_cache), cacheSize),
+                                   size_t dictionary_cache_size)
+    : _index(indexDir, std::move(posting_list_cache), dictionary_cache_size),
       _serialNum(0)
 {
     bool setupIndexOk = _index.setup(tuneFileSearch);
@@ -26,8 +26,8 @@ DiskIndexWrapper::DiskIndexWrapper(const std::string &indexDir,
 
 DiskIndexWrapper::DiskIndexWrapper(const DiskIndexWrapper &oldIndex,
                                    const TuneFileSearch &tuneFileSearch,
-                                   size_t cacheSize)
-    : _index(oldIndex._index.getIndexDir(), oldIndex._index.get_posting_list_cache(), cacheSize),
+                                   size_t dictionary_cache_size)
+    : _index(oldIndex._index.getIndexDir(), oldIndex._index.get_posting_list_cache(), dictionary_cache_size),
       _serialNum(0)
 {
     bool setupIndexOk = _index.setup(tuneFileSearch, oldIndex._index);
diff --git a/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.h b/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.h
index d493c16be79f..efe1dd87a287 100644
--- a/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.h
+++ b/searchcore/src/vespa/searchcore/proton/index/diskindexwrapper.h
@@ -17,11 +17,11 @@ class DiskIndexWrapper : public searchcorespi::index::IDiskIndex {
     DiskIndexWrapper(const std::string &indexDir,
                      const search::TuneFileSearch &tuneFileSearch,
                      std::shared_ptr<search::diskindex::IPostingListCache> posting_list_cache,
-                     size_t cacheSize);
+                     size_t dictionary_cache_size);
 
     DiskIndexWrapper(const DiskIndexWrapper &oldIndex,
                      const search::TuneFileSearch &tuneFileSearch,
-                     size_t cacheSize);
+                     size_t dictionary_cache_size);
 
     std::unique_ptr<search::queryeval::Blueprint>
     createBlueprint(const IRequestContext & requestContext, const FieldSpec &field, const Node &term) override {
diff --git a/searchcore/src/vespa/searchcore/proton/index/indexmanager.cpp b/searchcore/src/vespa/searchcore/proton/index/indexmanager.cpp
index ae25c12cfa94..e9cd4ca182e7 100644
--- a/searchcore/src/vespa/searchcore/proton/index/indexmanager.cpp
+++ b/searchcore/src/vespa/searchcore/proton/index/indexmanager.cpp
@@ -31,10 +31,10 @@ namespace proton::index {
 IndexManager::MaintainerOperations::MaintainerOperations(const FileHeaderContext &fileHeaderContext,
                                                          const TuneFileIndexManager &tuneFileIndexManager,
                                                          std::shared_ptr<IPostingListCache> posting_list_cache,
-                                                         size_t cacheSize,
+                                                         size_t dictionary_cache_size,
                                                          IThreadingService &threadingService)
     : _posting_list_cache(std::move(posting_list_cache)),
-      _cacheSize(cacheSize),
+      _dictionary_cache_size(dictionary_cache_size),
       _fileHeaderContext(fileHeaderContext),
       _tuneFileIndexing(tuneFileIndexManager._indexing),
       _tuneFileSearch(tuneFileIndexManager._search),
@@ -54,14 +54,14 @@ IndexManager::MaintainerOperations::createMemoryIndex(const Schema& schema,
 IDiskIndex::SP
 IndexManager::MaintainerOperations::loadDiskIndex(const std::string &indexDir)
 {
-    return std::make_shared<DiskIndexWrapper>(indexDir, _tuneFileSearch, _posting_list_cache, _cacheSize);
+    return std::make_shared<DiskIndexWrapper>(indexDir, _tuneFileSearch, _posting_list_cache, _dictionary_cache_size);
 }
 
 IDiskIndex::SP
 IndexManager::MaintainerOperations::reloadDiskIndex(const IDiskIndex &oldIndex)
 {
     return std::make_shared<DiskIndexWrapper>(dynamic_cast<const DiskIndexWrapper &>(oldIndex),
-                                              _tuneFileSearch, _cacheSize);
+                                              _tuneFileSearch, _dictionary_cache_size);
 }
 
 bool
@@ -90,7 +90,7 @@ IndexManager::IndexManager(const std::string &baseDir,
                            const search::TuneFileIndexManager &tuneFileIndexManager,
                            const search::TuneFileAttributes &tuneFileAttributes,
                            const FileHeaderContext &fileHeaderContext) :
-    _operations(fileHeaderContext, tuneFileIndexManager, std::move(posting_list_cache), indexConfig.cacheSize, threadingService),
+    _operations(fileHeaderContext, tuneFileIndexManager, std::move(posting_list_cache), indexConfig.dictionary_cache_size, threadingService),
     _maintainer(IndexMaintainerConfig(baseDir, indexConfig.warmup, indexConfig.maxFlushed, schema, serialNum, tuneFileAttributes),
                 IndexMaintainerContext(threadingService, reconfigurer, fileHeaderContext, warmupExecutor),
                 _operations)
diff --git a/searchcore/src/vespa/searchcore/proton/index/indexmanager.h b/searchcore/src/vespa/searchcore/proton/index/indexmanager.h
index 405139b7a40a..f48087be71ea 100644
--- a/searchcore/src/vespa/searchcore/proton/index/indexmanager.h
+++ b/searchcore/src/vespa/searchcore/proton/index/indexmanager.h
@@ -14,15 +14,15 @@ namespace proton::index {
 struct IndexConfig {
     using WarmupConfig = searchcorespi::index::WarmupConfig;
     IndexConfig() : IndexConfig(WarmupConfig(), 2, 0) { }
-    IndexConfig(WarmupConfig warmup_, size_t maxFlushed_, size_t cacheSize_)
+    IndexConfig(WarmupConfig warmup_, size_t maxFlushed_, size_t dictionary_cache_size_in)
         : warmup(warmup_),
           maxFlushed(maxFlushed_),
-          cacheSize(cacheSize_)
+          dictionary_cache_size(dictionary_cache_size_in)
     { }
 
     const WarmupConfig warmup;
     const size_t       maxFlushed;
-    const size_t       cacheSize;
+    const size_t       dictionary_cache_size;
 };
 
 /**
@@ -39,7 +39,7 @@ class IndexManager : public searchcorespi::IIndexManager
         using IDiskIndex = searchcorespi::index::IDiskIndex;
         using IMemoryIndex = searchcorespi::index::IMemoryIndex;
         std::shared_ptr<search::diskindex::IPostingListCache> _posting_list_cache;
-        const size_t _cacheSize;
+        const size_t _dictionary_cache_size;
         const search::common::FileHeaderContext &_fileHeaderContext;
         const search::TuneFileIndexing _tuneFileIndexing;
         const search::TuneFileSearch _tuneFileSearch;
@@ -49,7 +49,7 @@ class IndexManager : public searchcorespi::IIndexManager
         MaintainerOperations(const search::common::FileHeaderContext &fileHeaderContext,
                              const search::TuneFileIndexManager &tuneFileIndexManager,
                              std::shared_ptr<search::diskindex::IPostingListCache> posting_list_cache,
-                             size_t cacheSize,
+                             size_t dictionary_cache_size,
                              searchcorespi::index::IThreadingService &threadingService);
 
         IMemoryIndex::SP createMemoryIndex(const Schema& schema,
diff --git a/searchlib/src/vespa/searchlib/diskindex/diskindex.cpp b/searchlib/src/vespa/searchlib/diskindex/diskindex.cpp
index ced0a301fd25..77759cd60e72 100644
--- a/searchlib/src/vespa/searchlib/diskindex/diskindex.cpp
+++ b/searchlib/src/vespa/searchlib/diskindex/diskindex.cpp
@@ -46,15 +46,15 @@ DiskIndex::Key::Key(const Key &) = default;
 DiskIndex::Key & DiskIndex::Key::operator = (const Key &) = default;
 DiskIndex::Key::~Key() = default;
 
-DiskIndex::DiskIndex(const std::string &indexDir, std::shared_ptr<IPostingListCache> posting_list_cache, size_t cacheSize)
+DiskIndex::DiskIndex(const std::string &indexDir, std::shared_ptr<IPostingListCache> posting_list_cache, size_t dictionary_cache_size)
     : _indexDir(indexDir),
-      _cacheSize(cacheSize),
+      _dictionary_cache_size(dictionary_cache_size),
       _schema(),
       _field_indexes(),
       _nonfield_size_on_disk(0),
       _tuneFileSearch(),
       _posting_list_cache(std::move(posting_list_cache)),
-      _cache(*this, cacheSize)
+      _cache(*this, dictionary_cache_size)
 {
     calculate_nonfield_size_on_disk();
 }
@@ -198,7 +198,7 @@ DiskIndex::lookup(const std::vector<uint32_t> & indexes, std::string_view word)
 {
     Key key(indexes, word);
     LookupResultVector result;
-    if (_cacheSize > 0) {
+    if (_dictionary_cache_size > 0) {
         result = _cache.read(key);
         if (!containsAll(indexes, result)) {
             key = Key(unite(indexes, result), word);
diff --git a/searchlib/src/vespa/searchlib/diskindex/diskindex.h b/searchlib/src/vespa/searchlib/diskindex/diskindex.h
index 5d16a3c079d7..d692e1a16a7d 100644
--- a/searchlib/src/vespa/searchlib/diskindex/diskindex.h
+++ b/searchlib/src/vespa/searchlib/diskindex/diskindex.h
@@ -57,7 +57,7 @@ class DiskIndex : public queryeval::Searchable {
     using Cache = vespalib::cache<vespalib::CacheParam<vespalib::LruParam<Key, LookupResultVector>, DiskIndex>>;
 
     std::string                       _indexDir;
-    size_t                                 _cacheSize;
+    size_t                                 _dictionary_cache_size;
     index::Schema                          _schema;
     std::vector<FieldIndex>                _field_indexes;
     uint32_t                               _nonfield_size_on_disk;
@@ -74,10 +74,10 @@ class DiskIndex : public queryeval::Searchable {
      * Create a view of the disk index located in the given directory.
      *
      * @param indexDir the directory where the disk index is located.
-     * @param cacheSize optional size (in bytes) of the disk dictionary lookup cache.
+     * @param dictionary_cache_size optional size (in bytes) of the disk dictionary lookup cache.
      */
     explicit DiskIndex(const std::string &indexDir, std::shared_ptr<IPostingListCache> posting_list_cache,
-                       size_t cacheSize = 0);
+                       size_t dictionary_cache_size = 0);
     ~DiskIndex() override;
 
     /**