Indices.fielddata.cache.size will be allocated within heap or outside heap?

Elastic Stack Elasticsearch
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Hi Team,

Q1). indices.fielddata.cache.size is set as 10% of heap by default. Does it mean it will consider 10% of heap lets say 1.2GB and it will allocate within heap or will it go outside of heap and take from overall system memory allocated?

Q2). Does this setting mean while writing or while reading a data?

Q3). Does this mean it will allocate 1.2G for each connection requested? Or for all connections put together it shouldn’t exceed 1.2GB? Why am asking this is if its per connection then if there are 10 requests made then can it allocate 1.2GB*10?

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