[8.15] Fix Synthetic Source Handling for bit Type in dense_vector Field (#114407) #114759
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…lastic#114407) **Description:** This PR addresses the issue described in [elastic#114402](elastic#114402), where the `synthetic_source` feature does not correctly handle the `bit` type in `dense_vector` fields when `index` is set to `false`. The root cause of the issue was that the `bit` type was not properly accounted for, leading to an array that is 8 times the size of the actual `dims` value of docvalue. This mismatch will causes an array out-of-bounds exception when reconstructing the document. **Changes:** - Adjusted the `synthetic_source` logic to correctly handle the `bit` type by ensuring the array size accounts for the 8x difference in dimensions. - Added yaml test to cover the `bit` type scenario in `dense_vector` fields with `index` set to `false`. **Related Issues:** - Closes [elastic#114402](elastic#114402) - Introduced in [elastic#110059](elastic#110059) (cherry picked from commit 465c65c)
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