In below code, why we need to apply sentencesplitter transformation when we already set Settings.chunk_size as some value. Code is taken from official documentation - # Global settings from llama_index.core import Settings
Settings.chunk_size = 512
Local settings
from llama_index.core.node_parser import SentenceSplitter
index = VectorStoreIndex.from_documents( documents, transformations=[SentenceSplitter(chunk_size=512)] )
