• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.

• There are 5,037 files with 673,297 lines of code.
• 61 very long files (98,434 lines of code)
• 173 long files (117,927 lines of code)
• 633 medium size files (196,388 lines of codeclsfd_ftr_w_mp_ins)
• 946 small files (135,202 lines of code)
• 3,224 very small files (125,346 lines of code)

There are 2720 files with lines longer than 120 characters. In total, there are 15557 long lines.

File	# lines	# units	# long lines
PainlessParser.java in modules/lang-painless/src/main/java/org/opensearch/painless/antlr	4894	593	154
SnapshotsService.java in server/src/main/java/org/opensearch/snapshots	3027	90	154
HighlighterSearchIT.java in server/src/internalClusterTest/java/org/opensearch/search/fetch/subphase/highlight	3013	94	136
DefaultSemanticAnalysisPhase.java in modules/lang-painless/src/main/java/org/opensearch/painless/phase	2607	48	132
IndexAliasesIT.java in server/src/internalClusterTest/java/org/opensearch/aliases	1284	35	113
SearchQueryIT.java in server/src/internalClusterTest/java/org/opensearch/search/query	1849	61	106
BlobStoreRepository.java in server/src/main/java/org/opensearch/repositories/blobstore	2433	86	104
ShardIndexingPressureIT.java in server/src/internalClusterTest/java/org/opensearch/index	700	12	101
SearchModule.java in server/src/main/java/org/opensearch/search	1161	37	100
IndexShard.java in server/src/main/java/org/opensearch/index/shard	2967	191	85
FieldSortIT.java in server/src/internalClusterTest/java/org/opensearch/search/sort	1662	28	83
ChildQuerySearchIT.java in modules/parent-join/src/internalClusterTest/java/org/opensearch/join/query	1571	38	81
SharedClusterSnapshotRestoreIT.java in server/src/internalClusterTest/java/org/opensearch/snapshots	1951	41	76
InternalEngine.java in server/src/main/java/org/opensearch/index/engine	2460	157	71
RestIndicesAction.java in server/src/main/java/org/opensearch/rest/action/cat	667	15	68
DefaultConstantFoldingOptimizationPhase.java in modules/lang-painless/src/main/java/org/opensearch/painless/phase	989	42	65
PercolatorQuerySearchIT.java in modules/percolator/src/internalClusterTest/java/org/opensearch/percolator	1188	15	64
IndexRecoveryIT.java in server/src/internalClusterTest/java/org/opensearch/indices/recovery	1968	37	64
MetadataIndexStateService.java in server/src/main/java/org/opensearch/cluster/metadata	956	18	63
Setting.java in server/src/main/java/org/opensearch/common/settings	1662	201	60