Strangely, "indication" is not a listed synonym of "observation": See below.
1. watching, study, survey, review, notice, investigation, monitoring, attention, consideration, examination, inspection, scrutiny, surveillance, contemplation, cognition, perusal careful observation of the movement of the planets
2. comment, finding, thought, note, statement, opinion, remark, explanation, reflection, exposition, utterance, pronouncement, annotation, elucidation, obiter dictum This book contains observations about the nature of addiction.
3. remark, thought, comment, statement, opinion, reflection, assertion, utterance, animadversion Is that a criticism or just an observation?"
More ironically is the fact that 'observation' is not a listed synonym of 'indication': see below.
noun sign, mark, evidence, warning, note, signal, suggestion, symptom, hint, clue, manifestation, omen, inkling, portent, intimation, forewarning "
Please use the English language as it was designed to be used. Not allowing for the privately issued supplements to the standardized listings of definitions and proper synonyms.
When you learn the English language and proper use of words, then maybe you can hold an intelligent conversation.